An intense feeling of exhaustion, which leads to irrational acts of stupidity, such as sticking a giant cucumber in your pants and standing in the middle of a highway. Symptoms include fits of bizzare laughter, extreme muscle fatigue,and loss of all mental capabilities. Causes include, but are not limited to: heavy farm work, long distance running, hanging out with your friends for too long. WARNING: if you or your friends are experiencing "gerbs" quit working, find shade and drink water immediatly, or risk the effects of this terrible ailment.
"Oh dude, shit. Gerbs." or "Geh...ge....gerbs....."-then die a slow death. or just plain old "GEERRRRRRBS"