This is when your scrotum is larger then your penis causing an irregular and disappointing sight for your sexual counterparts.
monfreece: How longs your penis?

Jimmy: its 2 inches

monfreece: thats not to big is it

jimmy: but my sacks 4 inches

monfreece: damn, you've got a little dick with a fat sack
by hellopele July 31, 2010
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Big fat dope sack is a sack ful of marijuana or some people who take drugs call it heroin. Big fat dope sack is metioned in Dr.Dre's classic song 'Deep Cover'
You: yo is that full of dope?

Them: yeah its one big fat dope sack innit

You: yeah its huge!
by Da do Criminal October 9, 2009
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When you are born with 12+ testicles in one scrotum.
WHOA HE HAS A FAT SACK
by Ms. Mccain March 20, 2017
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