foofer valve 

A phrase used to caution someone before undertaking any difficult task.

I will help you carry that couch.

ok thanks, but dont blow a foofer valve.

can apply to most situations.

foofer valve by hmorrison March 5, 2011

Foofer valve 

A highly technical description of an electrical part that is unknown

Techo 1: Hey, why isn't that working?
Techo 2: Not sure, I think it's blown a Foofer Valve

Foofer valve by mikey_bear July 2, 2009