Lady Gaga has unleashed a scathing attack on a group of Twitter.com users for mocking a bullied gay fan who took his life last year.

The phrase #GagasCareerDiedWithJamey became one of the most popular Twitter topics on Thursday as users made reference to tragic teen Jamey Rodemeyer, who allegedly took his life after years of bullying over his sexuality.

The Bad Romance hitmaker was outraged by the craze and took to her own Twitter page to defend Rodemeyer.

She writes, "Tweets about a 14 yr olds suicide in order to take a jab at me? Consider your integrity making fun at a dead child's pain.

"Direct your insults (at) Lady Gaga, I can take it. Don't bring in those who are not alive anymore to defend themselves. Be braver than that."

The singer launched a campaign to make bullying illegal after learning that New York native Rodemeyer had committed suicide to escape his tormentors last September. (PAW/WNTWT/ZN)