Meaning

noun the combined stakes of the betters

noun the cumulative amount involved in a game (such as poker)

noun young domestic cat

originFrom kitt(en) + -y (diminutive suffix). Compare Dutch katje (“kitty”). Etymology 1 sense 2 (“vulva and/or vagina”) is probably modelled after the use of pussy to refer to the body part, from the appearance of an unshaven vulva.

Etymology from Wiktionary, CC BY-SA 3.0