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2 definitions by Grumpkin

 
1.
Used to describe someone who suddenely becomes extremely tired, incoherent, and who may fall into a deep sleep at night - especially if if the transformation occurs at midnight. Often used in as an affectionate descriptor and a form of endearment.
Watch out - she becomes a pumpkin at midnight!

You were a complete pumpkin last night.
by Grumpkin April 16, 2006
 
2.
Describes sosmeone who suddenly turns extremely and uncharacteristically grumpy at night, particularly after midnight. Word evolved from pumpkin - someone who suddenely turns sleepy at midnight.
Watch out - after midnight she turns into a grumpkin!
by Grumpkin April 16, 2006