To stop acting rationally and start acting foolishly; to go nuts.
Aw,ya just came home from doin' a bib!
Tell me whatcha gonna do?
ACT A FOOL!
("Act a Fool" by Ludacris)
by David E. K. December 1, 2005
Yo car just stopped on an empty tank, tell me what yo gonn do? act a fool
by Fire[P]hoenix September 28, 2006
ta be CRAZY!!! a crazy bad ass fool, trippin out lyke a mofo....ah yes, y wudnt yu wan do that?

Some punk just tripped up and made you spill your drink
Tell me whatcha gon do? ACT A FOOL
by jea June 29, 2003
to do sumting crazy and our of that ordinary
u jus got hustled fo a wad of cash wat ya'll gonna do? act a fool
by urban b!tch June 20, 2003
To freak out on some bitch who piss yall off to act on dat fool
some body in and cleaned out ur crib! tell me wut u gone do ACT A FOOL
by Jazmin July 7, 2003