What is the name of this REAL song?

It's a classic rock song. All I know is the chorus. It goes as follows:

"Now your messin' with a...
A son of a bitch!
Your messin' with a son of bitch."
(repeat 2 times)

Any help would B appreciated. I would like 2 know the artist name and the name of the song.

THX

Guns n' Roses: The Spaghetti Incident: Hair Of The Dog

Hardly what I'd consider classic rock.

BTW, I didn't know this song. I googled for it and there was only one page of answers. Perhaps if you'd spelled ``you're'' correctly....

Hair of the Dog
Heartbreaker soul shaker,
I've been told about you.
Steamroller midnight stroller,
what they've been saying must be true.

Red hot mama, velvet charmer.
Times come to pay your dues.

Now your messin' with a, a son of a bitch.
Now your messin' with a son of a bitch.

Talkin jivey poison ivy,
you ain't gonna cling to me.
Man taker born faker,
I ain't so blind I can't see.

By Britny Fox from the Boys in Heat album.

Actually I found out. It was originally by Nazareth. G&R made a remake. THX tho

Ahh. Sorry for the misinformation.

No...No...It's cool. I'm not pissed.

Wish I saw this post sooner...I used to dance to this tune back in the 70's...I knew it was Nazareth....YEOW I'm old now