Top Definition
When a guy is having sex with a girl and he hits the back wall of her vagina.
My girlfriend is so small that every time we have sex, I hit reef.
by Nick77 April 12, 2008

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When you're banging a chick and your dick is so long that it hits her cervix.
me: "dude! my new gf is so small i hit reef last night!"

friend: "bullshit, dude. you're asian."
by botokuno July 31, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt