A vagbak (pronounced "vagback") is the term used for the immense inward crevasses located on either side of an obese persons back. The flab's of extra fat look like meaty vagina lips protruding from one's sides. Derived obviously from the words "Vag" and "Back".
"Dan was said to have been caught lovingly fucking one of Randall's vagbaks."

"Chris maybe you should lay off the sweets for a wile, your tight shirt looks like a thong on those vagbak's of yours."

"When i tried to fight that fat kid i ended up fisting his vagbak."
by LifeFlip August 20, 2009
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