Here is the sentence including the word.
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= "to build" or rather "to f***ing build" if one were to translate the nuance intended.
「ぶっ」 is a manly and slangy verb prefix that emphasizes the meaning of the verb. The core meaning of the verb itself stays the same even if the prefix is added.
Related verb prefixes for emphasis:
「おっ」、「かっ」、「つっ」、「つん」、「とっ」、「ひっ」、「ひん」、「ぶち」、「ぶん」、「ふっ」, etc. There might be a few more.