Bob Dylan Positively 4th Street
“You got a lotta nerve* to say you are my friend
When I was down* you just stood there grinning
You got a lotta nerve to say you got a helping hand to lend
You just want to be on the side that’s winning”
* To have a lot of nerve: to be audacious, presumptuous.
* To be down: (colloquial) to be sad, unhappy.
In colloquial English grammar and spelling are often ignored. This also applies to song writing (poetic license). In the verses above for example Dylan ignores the present perfect (“you got”, not you’ve got”).
With regard to spelling look at “lotta” = lot of.
The verse is just the first in the song,
If you look at the links below you will find many more colloquial expressions, idioms, slang etc.
Use your dictionaries to find their meanings. These expressions are very important if you are learning English, as this is how many people you will meet outside business of formal environments speak.
The YouTube video: