A banana for friends.
A pun. The first word "蕉" means "banana", which sounds similar to the verb "do"(交), making the phrase sound like "be a friend".
On the other hand, "Banana" also stands for Mr. Banana,check post #3637572 for detailed note about Ricardo Milos.and that's why there's a signal "♂" for GachiMuchi Series in the phrase.