Obby= o bby= oh baby.
Pronounced: aw bee.

See:oh baby,babeh.
Guy: *smacks ass*
Girl: obby!
by Jay :3 June 23, 2008
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In Roblox, a obstacle course.
In Minecraft, obby is short for obsidian, commonly used on faction servers.

Player1: Hey kid, do you want to play a obby?

Noob: N0 thx m8 i b4d at 0๐Ÿ…ฑ๐Ÿ…ฑys xD lit saveage famm


Player1: Anybody selling some obby? I need to build a new base.

Player2: I'll sell ya a stack of obby for 50,000.
by LitBot May 07, 2018
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A klepto thief who uses piss vapour to distract you from when he steals shit.
You: Obby, you smell like piss. Hey! Where the heck is my black marker?
by Bahati September 04, 2007
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