Green’s Dictionary of Slang

(Irish) a kiss.

1991		B. Quinn Smokey Hollow 89: ‘Hey, oul’ Jimmy, does your mother know you’re out!’ ‘Go on, give her a goozer.’.
1997		Sun. Trib. (Dublin) 22 June n.p.: When Dekko arrives at Pauline’s gaff, she could be heard enthusiastically giving him a toe-curler of a goozer [BS].