(pronounced: "five squared") A slang term originating in Polk County, Fl., "5square" is an intense smoking session where five people all put in five dollars for a quarter of mids, and smoke it all within two to three hours.
Alternatively, "5squared" is a slang term coming from the same origins as "5square" meaning to be very stoned.
Billy: Hey bro you wanna do a 5square this Saturday?
Bobby: Hell yeah!!! Who all is joining?
Billy: Jimmy, Timmy, Johnny and us.
Bobby: Oh shit we're about to get so 5quared!!!