Green’s Dictionary of Slang

melkpens n.

[Afk. melk, milk + pens, stomach]

(S.Afr.) a young, na?ve and inexperienced person.

Drum (Johannesburg) 22 Mar. 28: I always get very worried when I see some ‘melkpens’ in Western Township thinking that there is some glamour in the underworld [DSAE].