A form of "rolling on the floor laughing", except used in an arcane way, as a ways of the person laughing knowing something the person being laughed at, doesn't. (Made Famous by Sandy Mehglich of the "You Suck at Photoshop" Series)
Doris stood, puzzled, when Richard roflcon'd because knew that no one would ask her to prom.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug