nounINFORMAL
noun: tight-ass
1.
a person who spends as little money as possible; a miser.
"he's a notorious tight-arse and is always very hesitant about coughing up for anything"
2.
an inhibited, repressed, or excessively conventional person.
"you are the most buttoned-up tight-arse that I have ever met"
1. rabo apertado