Definitions by Drewsmits

Instastalk 

When someone you have just met friends or messages you on facebook via smartphone during the time it took you to leave the bar and get home.

"Holy sh*t, she instastalked me. I can't decide if that's cool or not."

Or

"Don't friend her yet, your too close to instastalk territory."

Instastalk by Drewsmits February 9, 2010