Boots or booty?

It doesn't matter how many times I see this (and I see it enough that I'm pretty sure this is my second blog post about it), I still don't get it. Is this the younger generation's version of socks and sandals?

"I wasn't sure if it was a shorts day or a boots day today ...so I wore both! Problem solved." I realize that Vancouver has basically 2 seasons, cool & wet and warm & less wet, and that the transition between them can be confusing at times, but on no day EVER have I been conflicted between wearing fur boots or booty shorts.