A pejorative of limited usage, only having impact when used unintentionally, typically by the intoxicated.
See also dumbfuck, dumbfuckery.
After she stumbled out of her bedroom this morning, Beverly called me a "fuckdumb" and went back to sleep.
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Just as it sounds, friends that are so fucking dumb that sometimes you wonder why they're you're friends in the first place.
"Wow, Liz totally ditched me today after school. What a fuckdumb friend..."