(This song is a rip off to DEA LEPPARD "pour some sugar on me") it's actually a random comment i saw under a music video. And i still don't get both meaning and grammar..
Rip off is a 1960s slang phrasal verb which can mean either "steal [something from somebody]" or "rob [somebody of something":
He built bookcases with cinderblocks and boards he ripped off from a construction site.
Eighty bucks for an oil change. Those bastards really ripped me off.
The noun is usually spelled ‹ripoff›:
I scored tickets, but it was a real ripoff.
Your commenter is accusing the artist of plagiarizing a Def Leppard song.