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1.
The act of flubbing lyrics or not keeping time with a band during a song
We had to keep practicing the song over and over because the singer welshed it.
by log the drummer May 08, 2011
3 2
 
2.
To cover, spray, smear or shart your own human feces within the confines of a house, room or dwelling.

(Past-Tense only)
*walks into a room covered in human feces*

Woah dude somebody totally welshed in here!
by fubfub October 20, 2010
3 8