To rub one's semi erect penis (chub or chubby) against someone
Hey! Bro, don't chub swipe me!
Tits that droop to an extent they appear closer to the woman's knees than mid chest. Typically observed on women with large breasts lacking firmness. Breasts that hang and sway like a pendulum. Often seen on older women, obese women, and women that do not wear a bra.
Damn! All the women in that picture in National Geographic had knee shooters!
Large tits that are so droopy they hang toward the woman's knees. Often seen on obese women, or older women whose tits are no longer firm.
Jeez! That granny has some knee shooters!