Men who wear shorts that stop above the knee have a case of the dad knees. Mostly popular pre-2000's with middle-aged men (dads).
Billy had a growth spurt so we're taking him shopping for new shorts to cover his dad knees.
I can't find any decent shorts here because they're all dad-knee style. I don't even own boat shoes to go with them.
The 80's dad-knees style is coming back in a big bad way with hipsters.