To gain advantage against another player in a video game without necessarily cheating, but by relying on cheap tricks (eg. relying on the easiest weapons to use, relying on methods that avoid confrontation rather than engaging, relying on spawn camping, etc.) and basically doing their best to win without really applying any gameplay skill. Usually conducted by players who expect to lose a direct competition.
"Stop cheesing, noob! You know your only kills on me have all been blind grenades!"
A sexual act in which a man mansutbates for an extended period of time while leaking small amounts of semen which later turns into smegma under the foreskin.
Jon: Bro yesterday i spent the whole day cheesing
Bill: Yeah i can see the huge white spot on your pants you fool