To "get stapled": Being a dumbass and trying to bench press more weight, or do more repetitions, than one is capable of without a spotter. Often caused by the presence of an attractive woman in the weight room coupled with a foolish ego. When large plates are on the bar and it lies across the chest of the weenie under it, it appears as though the barbell is literally a staple, immobilizing said weenie.
Look bro, that skinny little asshat got stapled trying to bench his own weight. Let's go punch him in the nads while he can't do anything about it, and then roll the bar over his neck... and then go do some roids... again.