Green’s Dictionary of Slang

gooser n.2

[goose v.3 (4)]

1. the penis.

[UK]Farmer & Henley Sl. and Its Analogues.

2. (Can.) a pederast.

[US]J. Sayles Union Dues (1978) 286: Another creepy-drawers, probably. Another old fag [...] Two already this morning, a gooser and a guy who offered him a place to sleep, who said he had a special feeling for young boys on the run.