When your nipples are looking old and wrinkly
Pass the lotion I have a major case of the grandpa titties right now!
a grand father who has the horniest titties ever, some times the titties can be semi horny but only on certain holidays including christmas, easter and hanukkah
P1: what does your family like to do for hanukkah?
P2: well my grandpa gets horny titties 24/7 during hunakkah
P1: that's some horny grandpa titties