Placing one's penis in the crevice at the back of a female companion's knee, resulting in pleasure when the lady-friend rapidly traps and releases the penis from in-between her thigh and calf, whilst she holds her foot to aid the fast and furious opening and closing action of suffocating and freeing his knob.
'Woiiii, the back of my gyal's knee is more moist than your fam's vajayjays put together! Loved every minute of trapping my knobby in there, especially when she kept doing this thing where it looked like she was opening and closing the back her leg like a pair of scissors, with my codge still in that dutty crevice! Best knee job ever! I was singing 'knees bent, arm stretched ra-ra-ra' throughout that crazy shit!'