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.
6π 4π
When a female body builderβs enlarged clit is too erect and visibly protruding under their pants, so they tuck it into their vag to keep it hidden.
βAy bro, did you see that chick over there by the squat rack? Iβm pretty sure I just saw her do a Russian V Tuck. Haha, sheβs probably got one bigger than you!β