When you smoke a lot of tree and when you're coming down you feel hella tired, sometimes kinda shitty but also you'll just wanna sleep. Personally I feel more shlumped after i have a good head high like from good bong rips or woods.
"Wow, im feeling pretty shlupmed from smoking earlier."
"Gonna take a nap I'm hella shlumped"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.