Top Definition
A very satisfying nap, usually lasting over 2 or 3 hours. When waking from a fatty nap, one feels as if he or she has just slept in.
M: "Dude, that Geography lecture was so long, I can seriously use a fatty nap right now"

T & S: "what's a fatty nap?"

M: "Look it up on urbandictionary.com, it's probably there guys"
by yipyipster November 10, 2010
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