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1) v. to "like" every image in one's Instagram feed in a single, continuous session without regard for the quality of or interest in the content.

2) v. slang term used by millennials to describe a sex act by a male who prematurely ejaculates.
It took me forty-five minutes to Instablast, since I hadn't looked at my Instagram account in several days.
by joshuaware January 25, 2016
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2
v. to feel an immediate and mutual suspicion or dislike for someone you have just met
I can tell by his smug face that we aren’t going to get along. He’s on instablast.
by seeyounextwednesday September 17, 2016
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