A person who "cruises" is usually checking out someone they may already be interested in, or roaming the clubs and other venues looking for someone, usually for anonymous sex, or possibly even drugs. If accompanied by a crew
, a cruise may involve hours of mindless party hopping while under the influence.
Jim cruised the guy in the VIP section of the club.
Yo Dawg, I heard they have some bitchin frat parties popping tonight! Let's cruise around for some.