Green’s Dictionary of Slang

1. a man.

1960		J. Franklyn Dict. of Rhy. Sl.
1962		R. Cook Crust on its Uppers 19: To London — a proper ice-cream to look at.
1977		D. Powis Signs of Crime 188: Ice cream freezer Geezer (male person).
1984		‘Derek Raymond’ He Died with His Eyes Open 11: He doesn’t look like the kind of icecream who ever had much on him.
2000		J.J. Connolly Layer Cake 155: ‘The ice cream.’ Geezer. Kinky.

2. a person who can be easily duped.

1989

in G. Tremlett Little Legs 194: Ice creams punters or mugs who are potentially customers for prostitutes, street traders, pick-pockets, spivs or con-men.

3. (US campus) a form of address to a good friend.

1987

Eble Campus Sl. Fall 5: ice cream – noun of address for a good friend: Hey, Ice Cream. let’s go to the movies.