an acronym for the popular phrase; "On My Way To Fuck Your Bitch." This condensed acronym version is often used as a tag on pictures concerningspontaneous and often whimsical forms of motion and transport.
Bill: Dude this fat guy's on a slip&slide ripping down a hill
Dale: LMFAO DUDE, post and tag it OMWTFYB
When someone is really high, and you tell a story about something that had to do with the conversation brought up 10 minutes ago.
Kid 1: whose your favorite actor?
kid 2: pierce brosnan
Kid 3: sean connery
(10 minutes go by and now a new conversation)
kid 4: dude! I just had the biggest Omptompkin! I like Jackie Chan.
kid 2: what? That was so late.