A combination of the words "man" and "boobs." This is what happens when fat gathers in a male's chest area, and gives him the appearance of having breasts.
Usually seen in overweight males, but can strangely also occur in men who are not really overweight.

a fat mans boobs

Abreviation for "Man Boobs", a trait of overweight people.

man-boob, usually seen on fat guys

an abriviation for man boobs.
you can usually see these on fat ass brothers who drink and eat too much.
and generally they are seen holding a bucket of KFC.

when a fat male has such big rolls in the chest area it fools u into thinking tht tht man has boobs

man+boobs=moobs

a man who has oversized breasts's