Nasty, overproduced fizzy yellow beers that the masses buy with little to no regard for the fact that they are terrible.
Buddy: Hey I just picked up a 12 pack of PBR. Come on over!
Me: No thanks, I don't drink that groul.
n. A useless organism, that stands around doing nothing.
v. The act of grouling, where an organism is standing around not doing anything.
Hey Jim you remember that one time we... wait a minute.. what the Fuck is that groul doing!?