What a poor winner does

• Exults maliciously
• Is a poor winner
• Rejoices, in a smug way
• Is a braggart
• Says "I told you so!"
• Eschews modesty
• Acts smug
• Is a bad winner
• Says 'I told you so!'

Wiktionary Word definitions in Wiktionary
n. (plural of gloat English) vb. (en-third-person singular of: gloat)