Noun. 1.a good friend, pal, or buddy..chummy.adj. to be friendly.
2.Shark bait composed of unwanted or useless fish parts.
chummed;
chummer; chumming; ect.
3.SLANG.Semen or
sebum see also "smegma".
1.n."They are old chums"
adj."They are acting chummy"
2."I saw a
chummer chumming with chum, he
chummed all day"
3."Suck my chum!"