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1.
The hopelessness one feels after a strenuous day in AP Physics.
Normal Student: How's your day been?
AP Student: Terrible. I've got the phlump.
by plinny April 13, 2011
 
2.
Another word for Fez, can also be subbed-in at any point in any sentence. Fez - Hat with a tassle worn by people in the middle east.
Bob: "i got a Phlump at the gas station."
Steve: "well, i Phlumped a big one in the bathroom! Eat that you phlumper..."
by Joe P. January 04, 2004