A Jilly is another Spoonerism.
When you wear pants that are a size or two bigger than yours, you tighten your belt and it makes a bump on the jeans in the crotch area, looking like you've got a Jean Willy, or a Jean Boner...
Can be kind of embarrassing too...
Mike: Ay man, check it out, she just smsed me. haha Hells yeah
Tom: Dude, why do you have a boner? haha!
Mike: No man, that's my Jilly... So irritating! Arg!
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