lick my balls and call me trevor
An expression used when people are surprised or shocked. The name Trevor is just one of a number of names that can be used at the end of the phrase.
"Hey John, a rubber came in the post for you today"
"Well lick my balls and call me trevor, I wasn't expecting that until Thursday!
"Well lick my balls and call me trevor, I wasn't expecting that until Thursday!