Definition of prank up:
(v) :
(idiomatic) To increase, as the volume, power or energy of something.
(v) :
To start something mechanical, an act that often used to involve cranking.
(v) :
(idiomatic, reflexive) To muster up the mental energy to do something.
(v) :
(idiomatic, slang) To prepare (something).
(v) :
To describe in praiseworthy terms; to promote.
(v) :
(slang, intransitive) To inject heroin.