A sexual act between two lesbians. One lesbian, typically the dominant one in the relationship, proceeds to defecate on the vagina of the other lesbian. The two then proceed to scissor
, smearing the fecal matter over both of their vaginas. Oftentimes the two lesbians will not shave their pubic hair for a few weeks prior, building up a bush
to place the "mulch" around.
Carrie and Amanda were so busy mulching that they didn't hear the doorbell ringing.