Womp is a word used in the way that the Smurfs use the word smurf. It can be used to express happiness, sadness, loneliness, anger, fear, envy, hatred, disgust, a ritual chant, and pretty much anything.
You got an A in class, WOMP! That's so womping awesome!
Or the ritual chant:
WOMP! WOMP!
WOMP! WOMP!
WOMP! WOMP!
WOMP! WOMP!
WOMP! WOMP!
WOMP! WOMP!