When two groups are judged against different standards. The most commonly cited example: a promiscuous man is a player/pimp but a promiscuous woman is a slut/ho.
double standards aren't fair sometimes, but think about it...
a key that can open a lot of locks is an AWESOME key, but a lock that can be opened by a lot of keys is just a very shitty lock.
Two posts in a row that may or may not have the same meanings.
Complete disregard for the edit button.
Bob: I like pizza.
Bob: I also like pie.
twice the money or you lose all the money in street racing
we gonna run it double or nothing?
The act of getting with more then one girl/guy in one night, or cheating on your boyfriend/girlfriend
Yo we're about to go double dipping tonight!
Double-decker, or to pull a double-decker, is when a girl is having sex with two men, whereas one is thrusting his manhood in her ass, and the other man is penetrating her vagina. Often done to completely dominate the woman, and/or a symbol of the friendship between two men.
Man Oscar, we have gots to double-decker that Sandra chick, she is too fine.
When you penetrate anal and vagina one right after the other.
"Dude, she got some sort of infection in her vagina because we've been double dipping for like 8 months!"
The art of fucking 6 guys at once with the following combination: Two dicks in the mouth, two dicks in the pussy, and two dicks in the ass.
"I heard that whore got triple doubled last night by half the basketball team."