Angry Birds Drain

Playing Angry Birds for so long that it drains the battery of your mobile device.

Dude, I been texting you all day!! Where the hell you been?

Sorry Dude, Angry Birds Drain.

Drain the Swamp

Taking out the middle man

I'm going to drain the swamp as president.

Missouri Drain-O

To perform anal sex while using Sanitizing gel as a lubrication shortly after defecating.

Guy: "O baby, you just took a crap? Wanna do a Missouri Drain-O real quickly to clean it out?"
Girl: "I'd love to"

Drain the main vein

Slang for "Urinate"

"The Main vein" being the penis of course.

"I gotta drain the main vein something fierce"

Drain the Sea Monster

Used when describing the act of urinating, usually by pirates or uneducated people who think they're pirates. Originally used in the movie "Dodgeball."

Yargh! Stevie's gotta go drain the sea monster!

drain-o

When a girl only can do one thing to your penis orally

I want some drain-o from her

drain my pipe

To urinate.

I'm gonna go into the bathroom to drain my pipe.