When two people bash their bare asses together for sexual pleasure. Basically making out with your ass cheaks.
Timmy: Meso horny.
Jimmy: Wanna do a Bavarian Butt Bash?
Timmy: Okay just take the dildo out of your ass this time.
Jimmy: Wanna do a Bavarian Butt Bash?
Timmy: Okay just take the dildo out of your ass this time.
by FannyFondler December 15, 2008
Get the Bavarian Butt Bashmug.