Reach-Around Meaning

(basketball) A passing style in which the ballhandler performs a crossover step in the direction of the intended pass and then extends his or her arms to throw the pass around the defender.

Example: Manual stimulation of a sexual partner's genitals during anal or vaginal intercourse from behind.
2010, Christopher Hitchens, Hitch-22, Atlantic 2011, p. 153:
  Tom adored to give pleasure while Gore has always liked to boast that he has never knowingly or intentionally gratified any of his partners. Not even a sighing reach-around by the sound of it.