Russian Tuck
When a man gets around, and in an effort to hide his erect penis, tucks it under his belt/waistband in order to avoid embarassment. "Russian" is replacing "rushing", because it would be quickly used to hide your erect member.
Dan got a boner in class, so before he got up, he quickly did a Russian Tuck, so no one would see his gargantuant boner.
Russian V Tuck
When a female body builder’s enlarged clit is too erect and visibly protruding under their pants, so they tuck it into their vag to keep it hidden.
“Ay bro, did you see that chick over there by the squat rack? I’m pretty sure I just saw her do a Russian V Tuck. Haha, she’s probably got one bigger than you!”