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1.
pubic hair slang for nappy hairs found on the male genetalia mostly on the testicles (nuts)
"awwwww my nut grass itches"

"damn charlie ya got some some hotchpotch stuck in yer nut grass
by sarah and jill November 07, 2005
 
2.
Ball hair
Walt may have some nut grass but Lila has tons of butt grass.
by worddoc May 02, 2003