An over-tight t-shirt worn by an overweight man.
Jeff had gained several stone since he last wore the t-shirt, and it now clung to his body like a wet sheet draped over mounds of clay.

"Hey man, nice moob tube," commented one of his friends.
by Sir Garence October 22, 2010
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Droopy man boobs that, when packed into a too-tight shirt, create a uniboob across a guy's chest.
"That dude should NOT wear Under Armour shirts! It's SO tight it makes his moobs look like a Tube Moob!"
"Check out Home Boy's Tubey Moob - it looks like a uniboob sausage across his chest!"
by cool-chick-a-rama June 14, 2013
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