Somebody who is able to get alot of females in bed, another name for a player or somebody who takes advantage of females (gash being a females vagina)
Ma boy is a tru gashman, hes got so many girls on lock
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A gashman is a person who gets lots of gash (vagina) and is popular with the ladies.
Mate, Haroon is such a gashman, he bangs girls left and right.