Lose sb's temper (Out of temper ): Show sb about your temper; If sb has a bad temper, they become angry very easily.
Beat up: Hit sth
Pennant: Like a banner, flag.
From the time I was a kid, I beat up everything when I lost my temper frequently. Then did I realized how many wonderful things I had lost. So, I'd like to read a pennat to remind myself or somebody who likes to me: Never beat up anything while you lose your temper.
