Top Definition
Stands for: "I Got A Massive Boner"
Abbreviation used in chats when someone gets so excited about something that it causes him to get a massive boner.
Person 1: I completed the game!1!!!!1111eleven
Person 2: IGAMB

Person 1: Put your hand inside your pants
Person 2: omg... i think IGAMB

Person 1: I think i just got a boner! :D
Person 2: Baah... u have nothing to do agaist me, IGAMB
Person 1: fu :'(
by btejedor July 02, 2011

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