Anatomic euphemism

Because most Transformers fiction is aimed at kids, and most Transformers don't have organic squishy bits, the fiction has introduced a lot of anatomic euphemisms for assorted bits of human anatomy, especially the one you sit on. Most are real mechanical or electronic terms, and also presumably real parts of Transformer anatomy.

Actuator
"Blow it out your actuator, three-face."
 * Blackarachnia, "Transform and Roll Out!"

Afterburner
"Now, let's kick afterburners!"
 * Slingshot, "Aerial Assault"

"Say uncle, or I'll shove your nose in your afterburner!"
 * Sideswipe, "City of Steel"

"Kiss your afterburners goodbye, Decepticon slime!!"
 * Spike Witwicky, "The Rebirth, Part 3"

Bearing
"This guy's got bearings of chrome steel."
 * Rhinox, "Beast Wars (Part 1)"

Boron compressor
"We were brilliant in battle, Megatron. The Dinobots overwhelmed us with sheer brute force!" "Brilliant, my boron compressor!"
 * Starscream and Megatron, "War of the Dinobots"

Command module
"Stick it in your command module, eight-eyes."
 * Rattrap, "Power Surge"

Crankcase
"Sorry about yankin' your crankcase."
 * —Bulkhead, "Total Meltdown"

Diode
"Aw, go ding your diodes and get defunct, Megatron. I'm not helping you do zilch."
 * Gears, "Changing Gears"

"Me Grimlock here again, Optimus Prime, to pull your diodes out of laser fire."
 * Grimlock, "Atlantis, Arise!"

"Chumley, you're one royal pain in the diode."
 * Optimus Prime, "Prime Target"

"I'll rip you to pieces with my bare claws, tear out your circuits with my teeth, and spit your diodes back at you!"
 * Scorponok (hopefully using a different definition of "diodes") to Unicron, "On the Edge of Extinction!"

Exhaust port
"Tell Megatron to blow it out his exhaust port. We're having a demolition derby."
 * Drag Strip mouthing off, "Starscream's Brigade"

"Have you got your processor up your exhaust port?"
 * —Ratchet, "Nanosec"

Fan belt
"Optimus! Elita-1!  Get your fan belts in gear!"
 * —Sentinel Prime, "Along Came a Spider"

Gearbox
"What's with you two? [Gestures toward pants area.] Is my gearbox hangin' out or somethin'?"
 * Rattrap, "Aftermath"

Lugnuts
"The other equipment has been salvaged, but you took the alien Transmetal driver. Where is it?" "Gone. Ain't that a kick in the lugnuts?"
 * Megatron and Depth Charge, "Feral Scream Part 2"

Magna fuses
"Kiss your magna fuses goodbye, Autobots!"
 * Megatron, "Fire on the Mountain:

Manifold
"I've got a plan, if all of you have the cast-iron manifolds for it."
 * Prowl, "The Ultimate Doom, Part 1"

"I don't like the idea of Megatron getting the antimatter formula. He can't be trusted!" "Sure can't, manifold-mouth!"
 * Starscream and Bluestreak, ""Roll For It"

Reactor linkage
"I repeat, Decepticonssurrender, or face the consequences!" "Yeah, and we repeatgo stuff it up your reactor linkage!"
 * Optimus Prime and Tailwind, "The Resurrection Gambit!"

Skidplate
"Yeah? And you can kiss my skidplate, fearless leader."
 * Rattrap, "Beast Wars (Part 1)"

Tailpipe
"Now they've got their tailpipes between their legs!"
 * Bombshell, "Quest for Survival"

"Hey, if you took that broomstick out of your tailpipe every once in a while, you might have some fun for a change!"
 * Rattrap, "The Agenda (Part 1)"

"Whoa! What crawled up your tailpipe?"
 * Bumblebee, "The Thrill of the Hunt"

Transistor
"If you guys don't give me my circuit back, I'm gonna start kickin' transistor!"
 * Gears, "Changing Gears"

"We are in deep transistor parts!"
 * Skyfire, "Day of the Machines"

Turbocharger
"I'm goin', too. I'm gonna boot some Decepticon right in his turbocharger."
 * Cliffjumper, "More Than Meets the Eye, Part 1".