Top definition
an ambiguous way of saying "sex partner." sounds really nerdy when people know what you're talking about.
So, he's fucking that chick over there? Yeah, you didn't know? She's his adult friend.

You look like you could use an adult friend.

My adult friend is so fun and flexble!
by AdultFriend September 17, 2010
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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