When you meet gregarious friends of a friend of yours and they automatically become your friends, too. While there's potential for meaningful relationships, instafriends usually remain cheerfully superficial.
"I went to a party with Frank, he introduced me to Sally, Joe, and Bob. We all exchanged numbers, yay, three instafriends!"
by hypello November 24, 2003
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one who is friends with you in real life, but too cool to follow you back on instagram.
hey is that john?

yea, he's friendly in person, even calls to hang sometimes, but seems more concerned about his followers on instagram.

oh, he's an instafriend?

yea, that's right.
by anaveragewhiteguy July 26, 2017
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1. Upon your first encounter with a person formerly unknown the instance where you are BFFL. Instafast like the drive thru at Starbucks.
Upon returning from cruise one Navy Sailor to a Navy Wife instantly hit it of as BFFL over a few beers and a wicked game of Rummy.

BAM Instafriends for life!!!!
by !3blackcats December 18, 2008
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