The maneuver of bringing your balls up over on both sides of the penis and then tucking your penis. While wearing tight pants it (your bulging testicles) appears as a yaks hoof or "yak paw." This is a complex and sometimes painful maneuver that should only be performed under extreme circumstances.
"Bro, did you see that chicks camel toe? No, but check out my yak paw! "
"Jimmy showed me his yak paw and I damn near threw up in my mouth"
"Hey Marlo, show me that yak paw again!...No way dude, last time I had to go to the hospital "