An informal adverb used to introduce a frank, candid statement — 'to be honest' or 'frankly speaking.'
ぶっちゃけ、彼の提案には賛成できない。
To be honest, I can't agree with his proposal.
ぶっちゃけ言うと、もう限界だ。
Frankly speaking, I'm already at my limit.
ぶっちゃけ、彼女に嫉妬しているんだ。
Honestly, I'm jealous of her.
A noun use meaning candid talk or the act of speaking one's mind (colloquial).
今日の飲み会はぶっちゃけトークが多かった。
There was a lot of frank talk at tonight's drinking party.
彼にぶっちゃけ話を聞かせてみたら、意外と素直だった。
When I let him speak frankly, he turned out to be surprisingly honest.
A colloquial emphatic adverb used like 'really' or 'extremely' (informal).
ぶっちゃけ疲れたから今日は早く帰る。
I'm really tired, so I'm going home early today.
あの映画、ぶっちゃけ面白かったよ。
That movie was actually really good.