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The need, nay, the biological requirement, to take a lengthy nap, more so than any other type of resting period.

It may also be phrased as "straight shluffin'."
Dude, I could shluff like a CHAMP right now. You know what? I'm gonna.

Yo man, are you awake?
Nah, I'm straight shluffin'.
by Colonel Shluff Sanders April 19, 2011