When a fat person has rolls on their lower back that form 3 rows on each side, resembling a muscular abdominal six-pack.
Check out the rolls on that fat guy! He has a six-back!
by Dr. Devience September 8, 2013
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The heroin junkie merry-go-'round:

Release from prison-back to using dope-re-arrest.

The addict's vicious cycle.
Johnny Threefingers: "Heard you're getting out of this craphole today."
Harry Hophead: "Pfft...well, I'll be back...you know me, man... ""I’ll be out the gate by eight / in the spoon by noon / fixed by six / and back in the pen by ten!”"
by TopCop March 29, 2014
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The bulges protruding from a fat chick's back when her dress is too tight. Usually above and below her bra and the spare tire aka love handles.
Six Back gives you wings
by MRS. DJ September 8, 2013
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