어서 부딪히다

go at it head-on; run into

A "-아서/-어서" clause of motion plus 부딪히다, "collide, run into". Four of the five lines are 가서 부딪히다, literally "go and hit it", which doubles as an idiom for tackling something head-on without preparation — told a room costs two and a half to three million won a night, the reply is "you've got to go and hit it!" The remaining line is 와서 부딪히다, something coming and hitting you. With only five lines the split between literal collision and the figurative sense isn't firmly pinned down here.