have (got) a short fuse
To have a tendency to become angered, enraged, or upset very quickly or easily; to have a short temper. I'm usually a pretty calm person, but whenever I start driving I find I have such a short fuse. When we were kids, my dad had a very short fuse, but he's mellowed out since then. Wendy's always had a short fuse, and, yes, it has gotten her into trouble before!
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