A sexy grandma/grandpa/grandparent who happens to be very stupid but also very kind. Think, "grand-person I'd like to f*ck" combined with "himbo".
Simone is such a gilfbo, honestly...
by Magjxjx October 26, 2020
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combination of gilf and bimbo/himbo/thembo

a grandma/grandpa/grandparent "i'd like to fuck" who is very stupid, sexy and kindhearted
i used to think he was a just a himbo, but it turns out he's a gilfbo!
by currymulligan October 26, 2020
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