Let’s throw out some euphemisms. They don’t have to be about sex. They can be about drugs, politics, stupidity, war…etc. How 'bout anything you wouldn’t openly talk to your Dentist about.
Waddaya got? 
In that same vein…
Dropping the chalupa
Dropping the Cosbys off at the pool
Pinching off a loaf
Taking the Browns to the Super Bowl
Going to an appointment with Dr. Herb Green.
Starting a forest fire/Burning trees.
Riding the Green Dragon.
Riding the White Tiger.
Taking your medicine.
Having some ice cream.
Smoking special cigarettes.
Having some candy/sugar.
Going to space.
Taking a trip.
Buffing the German Helmet
Slappin’ Uglies
Remember that commercial a while back for an online pharmacy? It was a middle aged guy trying to explain through euphamisms to a teen clerk that he was constipated.
“The, ah, general cannot deploy the troops. Know what I mean?”
The kid smiles cluelessly. “Mmm, no.”
one that sticks with me is:
Pushing Up Ms. Daisy
(although I wouldn’t have a problem chatting with my dentist about death… people still like to use euphemisms instead of saying “dead”)
also good:
Test Firing the Death Star
Recalibrating the joystick
Some Canadian Euphemisms For Sex…
Stuffing the Beaver.
Playing “Mountie.”
Fur Trapping.
Entering Parliament.
Pulling the Goalie.
High Sticking.
Now - if you wanted all of the euphemisms for “penis”… they’re here.
.
Choking the chicken.
One eyed trouser snake.
Watering the plumbing.
Delivering a load of logs.
Slap and tickle.
Drain the snake.
Drop a load off.
Brilliant.
Going to the library
Rosy Palm and her 5 friends
Revenue enhacement
5 finger discount
Smoke a rope
ton of sports euphemisms…
can of corn
heat, smoke, cheese, gas, number 1
yakker, duece, knee-buckler, drops off the table
This doesn’t strike me as an appropriate metaphor.
Smokin’ root.
Double clicking the mouse.
Clam lapping.
Squeezing the cheese.
Having a brown-out
downloading the brown file
Safety meetings - nobody works, nobody gets hurt…
Meeting of the Friends of Canadian Snowboarding
It’s a euphemism. I heard it once, in spite of myself I laughed, and I contributed it for that reason. It hurts nobody.
In other words, relax. No offense was intended.
Sounds perfectly appropriate, considering the poster.
Anyway:
Spilling dirty piss
…that’s all I got.
What are you trying to imply? Actually, I know what you’re trying to imply, but I want to see you write it out so that I can Pit you properly.
Repeating…It. Was. A. Joke. No. Offense. Was. Intended.
Geez.
I’ve heard this myself, and also laughed out loud in spite of myself. 
pizzabrat: Airman may be a conservative, but I can guaran-God-Damn-tee you he’s not a racist. I’ve never seen him make any negative comments towards people based solely on their skin color anywhere on these boards. And I can tell you one thing for sure: the U.S. Military is a particularly bad place to be a racist. Unlike most places I’ve worked as a civilian, I’ve always had someone of a different color than I in my chain of command.
Okay, now that’s over with:
Honking out a dirt snake
Rubbing one out
Calling Ralph on the white courtesy phone
Moving the mail