"Nicks" has no single defined meaning in New York City vernacular. The interpretation depends entirely on context:
Shortened names: Nicholas→Nick, Alexandra→Alex, etc. NYC's density accelerates nickname adoption.
NYC subway used brass tokens (1953-2003)—Y-cut, then solid. Older riders called them "nicks" (nickel-origin, though tokens cost $1.50+ by end). MetroCard (1993) and OMNY (2019) replaced them.
Generic US usage, not NYC-specific. "A few nicks" = a few nickels = trivial amount.
Common phonetic spelling of New York Knicks (Knickerbockers). "The Nicks won last night."
"The nicks" = police station holding cells or jail (British origin: "in the nick"). Used in NYC criminal justice contexts.
"Nicks and scratches" — minor cosmetic damage (cars, furniture, walls). Common in NYC apartment/vehicle inspections.
NoHo, SoHo, TriBeCa, DUMBO, BoCoCa — "nicks" as shorthand for these portmanteaus (rare).
Ask: "In what context did you hear/see 'nicks'?" Speaker's age, borough, community, and topic narrow it instantly. Without context, the Knicks (basketball) and nicknames (universal) are the most frequent referents in contemporary NYC.