miss the boat!!

オレンジ部分を推測してみてください：D

Bob: Hi, John. I've got Avril's concert tickets!! Do you want to come ?

John:　What!? I really like her! When is the concert?

Bob: Tomorrow arvo.

John: I want to go, but I have lectures tomorrow.

Bob: Come on !! You don't want to miss the boat, right?

John: Yeah...OK, I'm going !

イラストの引用元http://goo.gl/a3glzB

arvo (アーヴォゥ） ⇒afternoon

miss the boat ⇒miss an opportunity

この二つはスラングというより、colloquial (話しことば）ですね：D

Written by uno