Initiating contact through someone's Instagram profile by liking their older posts. Sometimes responded by nothing, other times responded in the same fashion. Usually means they are interested in you and you should slide in their dms. Can be considered a mating call.
"Dude how did you end up talking to that hot chick at the bar last night?"
"Well I had her insta so I started with some Instagram sign language."
by Olivertwist23 January 22, 2019
Get a Instagram sign language mug for your dad Paul.