godan verb (-ru)
to well up; to be overcome with emotion; to be close to tears
Slangy, casual expression describing tears or strong emotion rising up. Often used when someone is moved, touched, or about to cry.
感動して涙がガシってきた。
I was so moved that tears welled up.
あの映画のラストシーンでガシった。
I got all choked up at the final scene of that movie.