FriendTM refers to the situation when a friend low on cash (the paper kind) pays the group's bill on his/her debit¹ card in order to get the cash from their friends--therefore avoiding both the ATM surcharge and the inconvenience of finding one.

“朋友提款机”指一群朋友出去消费后，其中一人用自己的借记卡买单，然后从朋友那里收取他们应付的部分，由此解决自己手中现金不足的状况。这样一来，此人既不用费力寻找自动提款机，同时还能省一笔提款手续费。

For example:

Hey guys, can I FriendTM this? I don't have any cash.

各位，我能用我的卡结帐然后你们给我现金吗？我手里没有现金了。