The action of a man, mostly a frat boy (or Bro) rubbing his male private parts in between another bro's backside cheeks.
Technically, the action doesn't have to be between two males. A woman's back side cheeks can be used as well, which is also commonly known as Ho Gliding or Bare Back Grinding.
"I got a six pack of natty ice! Let's bro glide!"
"Who's up for a game of, who can bro glide the best without bro'ing your load?"
A verb. Many tatted up bros, stuffed into a 4-door or extra cab truck with giant stickers driving around usually fast, with loud metal playing, in a massively raised truck with oversized tires. The kind of truck that would have been cool when you were 14. A sure sign of someone who bro glides: FMF sticker covering up the Ford logo and many dirt bikes that stay in the bed of the truck year round. You will usually find bro gliding in suburban southern california (look for "So-Cal" stickers, baggy pants, logo t's, black socks and bo hos). There have been rumors that bro gliding takes place in southern california deserts, like glamis, but not confirmed.
Yo what's up bro??? Lets go bro glide down to the liquor store so we can bro down tonight.