The side to side flailing motion of the handle bars of a bike, motorcycle, quad, or snowmobile when the back end comes off the ground and is usually followed by a face plant or wipe out.
'Bar Boobs' are when a girl falsely enhances the size of her breasts using push up bras and god knows what else, specifically when going out to the bars or clubs.
-"omg did you see becca's instagram pic from last night?!"
-"YUUUUS....her bar boobs were on point!!!"
-"I know right! I wonder if the guy she went home with was disappointed with what he found underneath"
-"You mean what he didn't find??"
Dude #1 : Hey dudes, my gf isn't giving me any; wanna go to a booty bar and see some hot strippers????
Dude #2: Naw, man. My girlfriend gives it up all the time. I haven't had blue balls in ages!!! And anyway, aren't those places crawling with crabs, blue waffles, and shit???