Top Definition
The mesh inside of a male's bathing suit that holds his package in place while he partakes in water activities.
Stewart's junk was clearly held close to his body during his cannon ball attempt thanks to his Undergotchies.
by BlackGennies July 07, 2009

See also: Gitch
Dang, Tammy left her undergotchies in my washroom - and my girlfriend found them...!
by Time4SumAksion May 09, 2005
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