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1.
To commit to do something with someone, only to appease them and not actually do.
Person A: We are going to celebrate a friends' birthday tomorrow night. Join us (insert location/time).

Person B: Sounds goods, I look forward to it. See you tomorrow night.

Tomorrow night comes, Person B is not there. You, believing they would be there due to previous conversation, have been officially Paddywhacked.
by AnotherPaddyVictim January 16, 2012
8 3
 
2.
To be killed by an Irishman.
"That poor British bastard."

"how'd he go?"

"Was fuckin paddywhacked"
by Henry McByrd July 09, 2009
5 3