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". Any phrase that replace 交 with 蕉 is bond to come with a signal "♂" for GachiMuchi Series, thus changing its meaning to a similar but more GachiMuchi Series oriented version.
e.g.
交朋友 = make friends
蕉♂朋友 = make GachiMuchi Series style gay sex friends
交流 = communication
蕉♂流 = communication with the means of GachiMuchi Series style gay porn activities
"Banana" also stands for Mr. Banana,check post #3637572 for detailed note about Ricardo Milos. Milos' memetic popularity made him an icon of GachiMuchi Series on Chinese internet.
