Two people who having been getting together for a while but won't admit they are in a relationship
Robin is Barney's common law girlfriend on How I Met Your Mother
by Bobun 5ever August 05, 2012

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Top Definition
When two people have been hooking up for an extended period of time but neither will acknowledge the relationship. They like to say they are just friends but spend lots of time just the two of them and sleep together.
Dude 1: I'm busy tonight. Leah and I are going to the movies.
Dude 2: Hanging out with Leah again, huh? How is that girlfriend of yours?
Dude 1: Dude, she is totally NOT my girlfriend. We're just friends.
Dude 2: Bro, you can't bang a girl for 6 months and tell me you're just friends. She is totally your common law girlfriend.
by anonymous7787 March 19, 2012

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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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.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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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