Grrday

Grrday:

Grr-day (Grr ′dē, -dā′)
n. Abbr. Grr.

A day to cold to leave the bed.

[Middle English, from Old English Gurdæg (translation of Latin: [i]cannus, be'arsesus[/i])
See, Hibernate]

Grr′days adv.

E.g:- Roll stayed in bed as it was Grrday.