please help me to understad the meaning of the sentence down

[maryam63]

I can't think why I let you talk me into dealing with that ridiculous man and his back street sideshow."

 

[bhaisahab]

I can't think why I let you talk me into dealing with that ridiculous man and his back street sideshow."

Context might help.

 

[Mr_Ben]

I [can't think] why I [let] you [talk me into] [dealing with] that ridiculous man and his [back street sideshow]."

I [don't know] why I [allowed] you [to convince me] [to interact with] that ridiculous man and his [figurative circus].

 

[5jj]

Until we have more context we do not know what the backstreet sideshow is.