I was watching an episode of One Piece, and while studying the transcript, I came across this sentence.
ルフィに 会いてえんなら俺が 教えてやるよ
Ace told the other pirates "If ya wanna meet Luffy, I'll tell ya where he is". In the word 会いてえん, what does the えん part mean? Is it some sort of grammar construct? Is it commonly used in colloquial Japanese? Thanks guys!