[A.A. Cunningham]

meatless Fridays during Lent.

Galeone needs to be reminded that unless he has indicated another form of penance, all Fridays are still meatless.

Can. 1251 Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays, unless a solemnity should fall on a Friday. Abstinence and fasting are to be observed on Ash Wednesday and Good Friday.

[Dominick]

Can. 1251 Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays, unless a solemnity should fall on a Friday. Abstinence and fasting are to be observed on Ash Wednesday and Good Friday.

Many ordinaries permit good works as a substitute.

NCCB Complementary Norms on Penance and Abstinence of November 18, 1966:
Among the works of voluntary self-denial and personal penance which we especially commend to our people for the future observance of Friday, EVEN THOUGH WE HEREBY TERMINATE THE TRADITIONAL LAW OF ABSTINENCE AS BINDING UNDER PAIN OF SIN, as the sole prescribed means of observing Friday, we give first place to abstinence from flesh meat. We do so in the hope that the Catholic community will ordinarily continue to abstain from meat by free choice as formerly we did in obedience to Church law.
(This quote by way of Fr. Mateo)

So you can abstain as a devotion, but if you don't it is not sinful. You should substitute a good work in it's place at a minimum.