Top Definition
Modern term like LOL or ROFL, meaning:

"laughing so much I stomped on your new kitten".

A popular phrase, which definitely needed shortening to an easy to remember version like LSMISOYNK.
Person 1: I found that bloke in a public toilet, "having fun" with baked beans

Person 2: LSMISOYNK
by Backrub the terrorist June 06, 2010

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