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1.
When two friends, usually male, form a bond that's so strong that thoughts begin to transfer between individuals. Symptoms of gay link (or gaylink) include: completing sentences, responding mid-sentence with the correct answer or making eye contact and laughing because of a mutual understanding.
Gay Link Example 1:

Bro: Dude, this guy is a--
Other Bro: yea. he's a douche.
Bro: Damn shame.

Gay Link Example 2:
<Hot girl walks by>
<Bro looks at Other Bro>
<Approving nod>
by tai kwon bro August 07, 2011