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1.
A particular kind of bandwagon where participants routinely deride or denounce (bash) a particular object/person/concept merely because it is deemed popular to do so.
"Wayne Rooney is a thug!"

"You've never met Wayne Rooney, you don't know anything about him other than what you've read in the media - get off the bashwagon"
by MatDavey March 01, 2012