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1.
placing you penis across another persons upper lip.
While steve was passed out jack gave him a mulestache
by Joey Ligats October 23, 2008
 
2.
A mulester's mustache.
Andy Samburg has this Saturday Night Live video about this new dance. It's called 'The Creep' and they are all styling major mulestaches.
by kanihelpyou March 20, 2011