One who is... up to no good; sketchy; shady; a troublemaker; a theif
Them gobblecockin sons a bitches stole my toilet paper again!
Referring to paranoid drug addicts who think everyone is out to steal their possessions (their money, toilet paper, clothes, stash, food, drugs , etc)
"Listen to old rob over there, always gobble-cocking about someone stealing his toilet paper!'
"Who stole my shit cocksucker!!!" Said the Gobble-cocker.