Alternative form of plug nickel

(chiefly US, colloquial) A nearly worthless amount.

(chemistry, industrial) steel that contains approximately 6% of nickel, increasing its strength

A five-dollar bill.

(slang) Interstate highway 5.

(idiomatic, colloquial) A miser.

A five-dollar baggie of narcotics, especially marijuana. / A bagged portion of half a gram of narcotics.

(historical, attributive) Operated by a nickel, especially of an early jukebox or slot machine.

plural of nickel bag

(US slang) The national speed limit of 55 miles per hour introduced in the USA in 1974. / (US slang) The number 55 (by extension).