A horny chipmunk is a little boy who knows more about sex than he should. Usually he is very creepy and making sexual jokes with girls.
Example 1:
Pam: OMG! My little brother keeps saying that licking carpets turns him on. It's soo gross!
Sam: He is such a horny chipmunk.
Example 2:
The horny chipmunk who lives next door to me never shuts up about fellatio jokes.
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