When a man tucks his penis and testicles between his legs and prevents them from springing forward by squeezing his legs together. This is done in order to imitate a vagina. If said man were to turn around and bend over, you would have a Fruit Bowl
. The Taco is the opposite of the Ram
, which is achieved by pulling the testicles up and partially over the penis.
"That guy in 'Silence of the Lambs' was totally doing the Taco in front of the mirror."