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

Other days

fiancee

Fiancee Day
hannah

Hannah Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
reading

Reading Day
coffee

Coffee Day
aloxolt

Aloxolt Day
special education

Special Education Day
azonto is acceptable

Azonto Is Acceptable Day
gum

Gum Day