n. An unwelcome erection which arrives at the most inconvenient times and is hard to get rid of.

E.g. Yo Tony blud, lessons over, lets split.

Tony: Shit! I can't stand up, I got Jehovah's stiffness init!
by swany01 May 14, 2008
A Jehovah's Stiffness is a completely unwanted erection that appears at the worst of all times and once it appears, it absolutely refuses to go away for a VERY long time.

In reference to a Jehovah's Witness
For example getting a Jehovah's Stiffness on the bus or train just before your stop and you have to stand up and walk away but you know you can't is really annoying
by Stu Marble November 21, 2007