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

Other days

self appreciation

Self Appreciation Day
mean girls

Mean Girls Day
ponytail

Ponytail Day
slime

Slime Day
bounce

Bounce Day
lash

Lash Day
boba

Boba Day
ormille

Ormille Day
nae nae

Nae Nae Day
ruby

Ruby Day