Definition of tinkles:
(v) :
(intransitive, informal) To urinate.
(n) :
(informal, euphemistic) An act of urination.
(n) :
(informal, euphemistic) Urine.
(v) :
(intransitive) To make light metallic sounds, rather like a very small bell.
(n) :
A light metallic sound, resembling the tinkling of bells or wind chimes.
(v) :
(transitive) To cause to tinkle.