He's been earning a lot of dough lately and loves showing it off in front of his mates.

dough 的本义是"面团"，但在俚语中常用来指"钱"，因为面团可以揉成各种形状，就像钱可以变换成各种形式一样。这种用法带有非正式和幽默的色彩，多用于口语场合。