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1.
(see also probabry)

1. When you don't want to do something, because it sounds like it is going to be shit.

2. When a call is disputable, or just bullshit.

Note: Can be used sarcastically in either of these situations.
Guy 1: Wanna go to the Edgy? its gonna go off

Guy 2: Prehaps.
by MysteriousMister November 19, 2010
 
2.
What happens before something.
ie, "the haps" are to what happens at a party as "the prehaps" are what happens before it.
by Justine Carter January 14, 2006