Your girlfriends' best friend who's basically the third person in your relationship and not in a weird cockblocking sort of way she just fits among you and girlfriend and you couldn't imagine your relationship without her in it because she's not just girlfriends' friend... She's yours too. She drinks with you when girlfriend doesn't want to. She goes and eats with girlfriend when you're on a diet. She takes girlfriend to target when you don't want to go. She is an associative girlfriend and your favorite third wheel.
Example 1
Girlfriend:I'm hungry lets go eat allll the foods

You: no go call associative girlfriend I'm on a diet
by Panda_snorlax_friends August 26, 2015
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