It's usually used when you are surprised to learn something. Other uses are to add how serious you are being about something. The last and most obscure usage is to explain the status of a couple. They are "For Realsies" if they are officially dating.
The same as fo'real but was instead created by Crabstickz; from Youtube, in his last 'Advent Calundah' video before Christmas when almost falling over.
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"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.