mark off
to call in sick to work, usually because of drinking, bad sex, good sex, feel like partying, or are just lazy, usually with a lame reason
Man i went to the club after breaking rocks all day. I figured whiskey would help my back. It sure did but I didnt get any Puss. I was so pissed i marked off the rest of the week. Ill mark off next week to if my back dont get any better, for now Ill take a drink
off-mark
lacking relevance; unrelated; unconnected.
My answer to the query does not seem to be off-mark.