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1.
The feeling when you are buzzin' off something nice.
Man that cigarette after those three beers left me lumpin.
by SheriffOfNottyham September 05, 2010
 
2.
When you arrive at work the following morning after a night of heavy partying...hair a mess, shirt and pants wrinkled, eyes glassy...basically visually hungover
"Man you are lumpin this morning. How late did you stay at the bar last night?
by Willy June 25, 2003