Tits knees
Something awesome or just plain badass.
Man, your new car is the tits knees.
knee tits
Larger than average people with fat legs have overhanging lard on the inner knee area that resemble breasts.
Check out the knee tits on her!!
knee tits
Knee tits are tits that hang so low that they touch on your knees
Wow that girl dan has some serious knee tits