On ELU I found the following comments under a one-line answer (names have been omitted; emphasis mine):
A: While I agree with you, answers which just offer one man's opinion, and no data to back it up (e.g. nGrams or expert opinions or whatever) should be offered as comments, rather than answers proper. I didn't downvote you, btw.
B:... Nor I (one is enough here) but I've nicked @A's comment.
A's comment had three upvotes the last time I checked, so my supposition is that "I've nicked A's comment" is "I upvoted A's comment". However, "to nick" isn't defined in such terms in any dictionary I've checked. This is the most complete dictionary entry I've found for "to nick":
1.1. To cut a nick or notch in.
1.2. To cut into and wound slightly: A sliver of glass nicked my hand.
- To cut short; check: nicked an impulse to flee.
- Slang To cheat, especially by overcharging.
- Chiefly British Slang
4.1. To steal.
4.2. To arrest.
- informal (often foll by: off) to move or depart rapidly
- (Horse Training, Riding & Manège) to divide and reset (certain of the tail muscles of a horse) to give the tail a high carriage
- (tr) to guess, catch, etc, exactly
- (Agriculture) (intr) (of breeding stock) to mate satisfactorily
- nick someone for slang US and Canadian to defraud someone to the extent of
[The Free Dictionary]
I don't see how any of the definitions cited above fits the sentence given.
Is "to nick" being used figuratively? What does "I've nicked A's comment" mean?