Often used in colloquial english to signify a dance party that does not require any specific quantity of people (Can be Solo). Rather, the term contends that the actor(s) is often belligerent - or about to be. This term originated from years of dance partying throughout various venues and homes throughout Toronto, which became a staple slang terminology used by the young professional class.
Lets go to Union Nightclub, most people there will be will be having a Regan Dance Party.
by SirWhale December 12, 2013