Oops, it doesn't look like 'fuck yall day' is a national day..

Other days

unicorn

Unicorn Day
bow tie

Bow Tie Day
my little pony

My Little Pony Day
cuddle up

Cuddle Up Day
boy friend

Boy Friend Day
nail polish

Nail Polish Day
youth

Youth Day
bubble bath

Bubble Bath Day
gum

Gum Day
lisp

Lisp Day