A colloquial prefix that attaches to verbs or expressions to add forcefulness or emphasis to the action; similar in use to 'ぶっ-' in casual speech.
彼は腹を立てて、その古い机をぶち壊してしまった。
He got angry and completely smashed that old desk.
長い会議のあとでぶち疲れたと言っていた。
After the long meeting he said he was totally exhausted.
その問題にぶち当たって、しばらく解決策が見つからなかった。
We ran into that problem head-on and couldn't find a solution for a while.