forcefully; violently; emphatic prefix
Emphatic prefix attached to verbs, adding a sense of force, violence, or intensity. Similar to ぶっ, but ぶち is used before certain sounds. Colloquial and expressive.
He got angry and smashed the door.
Hearing that story, I felt like beating him up.
Derived from the verb 打つ (うつ, 'to hit'), with a sound change to ぶち. The exact historical development is uncertain, but it functions as an intensifying prefix in modern colloquial Japanese.