Under Gravy

The viscous combination of urine, loose stool, ejaculate, and possibly blood mixed inside of an elderly person's diaper.

Humphrey just couldn't wait to take out his dentures and slurp down some of Betsy's under gravy.

under the cocks

Going out for a tapped beer (directly translated from Danish: under hanerne.

Hi Guys, let' go under the cocks.

Under the dumpster

To be dead, but believed to still be alive

"Hey, what happened to John's grandfather?"
"He passed away, but John still thinks he's under the dumpster."

Under the bottom

Phrase describing something particularly underwhelming; lackluster.

Antonym of "Over the top".
Has nothing to do with what's under your seat.

"His sales approach was so under the bottom that everyone in the room fell asleep."

under the needle

Getting a tattoo

"Dude I'm getting more ink today"
"Ahh, going back under the needle"

Under The Jail

Life imprisonment without parole, especially when used with "up".

That man deserves to be up under the jail for stabbing that poor kid to death!

Under-blunted

Whilst rolling a marijuana blunt, you, or a friend may realize something detrimental, you need one gram to roll a blunt, but OH NO! Your poor ass only has .6, so being the determined person you are, you continue on your quest for a blunted highness...

You roll the blunt, the end result (looking like a small pen, a tooth pick, a brown joint, etc..) is what is commonly known as "Under-Blunted".

I bought a dime sack and tried rolling a blunt, but i failed and under-blunted my way to sobriety.