A full grown man who looks like a baby, and acts like a some type of awkward child. This usually includes being short, having an excess of fat, and protruding lips and/or brow. Usually to be classified as a "man baby", this person is encountered in a comic shop, an online video game, or as a dysfunctional co-worker that the manager keeps around either out of pity or relation.
I was in line at Best Buy for halo 3, and this totally sweaty man baby was ahead of me buying several weeks worth of anime porn.
by Arithmetics October 28, 2007
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