particle
Colloquial contraction of ばかり, used in casual speech to emphasize limitation or exclusivity. Often carries a nuance of 'all the time' or 'nothing but'.
See also: ばかり
彼はゲームばっかしてる。
He does nothing but play games.
最近、雨ばっかだね。
It's been nothing but rain lately, huh.