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Smiling artificially and excessively largely, as if a picture is being taken of you.
Man, I had to lie to my parents last night and I was cheesin' hard!
cheesin' by Walker, Seth, Ben February 9, 2005
The act of smiling, as if posing for a picture
She started cheesin' when the boy she liked gave her a compliment.
Cheesin' by Ali December 8, 2003
Smiling uncontrollably because you are high or otherwise intoxicated.
She hit the blunt and within minutes was cheesin' like a mug.
Cheesin' by Droznisu January 1, 2008
Being noticed in a flirtatious manner or noticing someone in a similar manner.
Damn Ed, you are cheesin' on her hard!

Dude, that chick over there at the bar is cheesin' you!
Cheesin' by Brian S July 19, 2005
Ayo why you cheesin' at that.
Cheesin' by Cheesin' February 16, 2020
Uncontrollable gaseous emissions from the anus caused by the ingestion of a food that doesn't agree with one's digestive process.
Dude, what the hell did you eat? You're cheesin' man.
Cheesin' by Todd December 10, 2003