"Sandy balls." XDD The accent makes it even better.
What she says is boring to me, and coming jokes are very boring a lot of times. Some sex jokes can be amusing, but a lot of them are stupid. (Example: my boyfriend showed me this "tig ol' bitties" video on youtube, I thought it was completely idiotic and unfunny.)
For some reason, it's easier for me to find it funny if it's not completely juvenile ("OMG PENIS LULULULZ") and if a girl delivers it. For some reason it's more amusing. But anatomy-words aren't really hilarious, and if one skirts around it like it's a bad word ("his 'you-know-what'/uhm, down, uh, there") it immediately becomes stupid.