Similar to action of popping a wheelie, in the way that wheelies rule. A wheelie is pretty cool and so if you can do one, you are in fact pretty cool. So it is like an emphatic "for realsie", meaning you have done such a cool "for realsie" you are cool. Something that is a "for realsie" with a bit extra "real".
Dude: "Dude! My ex just tried to weasel back into my life!"
Dudette: "You need to pop-a-realsie and tell her you got a sex change or something! It's a trap"