To do a girl doggy-style while she's on the rag. Pull out, dip in fingers, and apply 'war paint' under your eyes. Then resume doggy-style and let out a war cry.
Phil: Jamie was on the rag and wanted me to earn my red wings.
Ted: Yuck! What did you tell her?
Phil: I said 'HELL NO!', but I'll give you an Angry Indian instead.