When a male is having sexual relations with a pregnant lady friend, and during this carnal, love-making session the fetus of the pregnant lady friend reaches down, grabs the male's member, and begins to give him a blowjob.
Ben: How was sex last night with Jenny?
Brandon: Ah, it was just okay until I got a Brazilian Blowjob!
Ben: A Brazilian Blowjob!?! AWESOME! (AT THIS POINT BEN GIVES BRANDON A HIGH FIVE)