A fork of Rural Dictionary
when you boast about something you actually don't have in the moment of boasting about it, but rather say it in order to motivate you to get there faster so you wont end up lieing to your friends/acquantances and won't make a fool out of yourself.
"bro why'd u flex"
"ahh he's just mastering the art of boastivation"
"...wait... wha'?"