Loot harbour, causing misery

• Saboteur on a petty level
• (informal) someone who spoils the pleasure of others
• No barrel of laughs
• Coddles wine
• Kill-joy runs harbor for ill-gotten gains
• Plunder left for killjoy

Wiktionary Word definitions in Wiktionary
n. Someone who put an end to other's fun, especially harmless fun.

Wikipedia Word definitions in Wikipedia
Spoilsport is a fictional mutant character in the Marvel Comics Universe. Her first appearance was in Generation X #53 .

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM OTHER ENTRIES ▪ "I don't think we should go in there - someone might see us." "Oh, don't be such a spoilsport - come on!" ▪ Don't be a spoilsport , Richard. Come play with us. EXAMPLES FROM CORPUS ▪ And last night they were branded spoilsports ...