The result of smoking copious amounts of marijuana or hash and becoming comatose, couch-locked, or zombified. Another common result is smoking oneself to sleep.
Dude, I smoked a half ounce of hash last night! I got so bud fucked, I passed out with my bowl in hand.
A way to recognize a mistake
OR
A way to apologize
Rob: 'drops a bottle of olive oil'
Kenneth: "That's a fuck bud"
OR
Kenneth: 'Steps or Rob's ankle when walking behind him'
Kenneth: "That's a fuck bud"