Nerf1
/nəːf/originally and chiefly US
noun
A type of foam rubber used especially in the manufacture of children's toys and sports equipment. Usually attributive or in compounds.
- A trademark in the U.S..
Origin
1970s; earliest use found in Playthings. Apparently an arbitrary formation, although perhaps compare nerf.
nerf2
/nəːf/(also knerf) slang (originally US )
verb
[with object] Originally and chiefly in drag racing: to bump (another car).
Origin
1950s. Origin unknown. Compare earlier nerfing.