This is when a guy is having sex with a broad from the back, and then he wraps his arm around to the front, and starts fingering her, if hes doing her in the butt, or working the clit, if hes in the vagina. This should increase the pleaser the female feels during the intercourse.
Female: oh, what are you doing? It is making the sex more pleasurable.
Male: Yea, im just doin a little wrap around.