nut
noun
°A hard-shelled seed.
°A fastener: a piece of metal, usually square or hexagonal in shape, with a hole through it having machined internal threads, intended to be screwed onto a bolt or other threaded shaft.
verb
°(slang) To hit deliberately with the head; to headbutt.
°(slang) To ejaculate (semen).
synonyms: loony, nutbag, nutcase, nutter more» , bonce, noodle, head, ball, bollock, nads