Green’s Dictionary of Slang

February adj.

unfashionable.

1999

Indep. Rev. 8 June 4: Current American youth slanguage [...] February; out of style.

In compounds

February face (n.)

a sour or miserable face.

1599

Shakespeare Much Ado About Nothing V iv: Good morrow Benedick. Why, what’s the matter, That you have such a February face, So full of frost, of storm and cloudiness?