Childish Joke

I have left a bottle juice lay.
Name of this juice is 午後の紅茶.

午後 mean about "afternoon".

の mean about "of ".

紅茶 mean about "tea".

In fact,

午後の紅茶 mean about "Tea of Afternoon(＝Afternoon Tea)".

But during left it lay,

A relative child played a trick to it.

lololol.....

午後→牛後

牛 mean about "cow"

後 mean about "after"

hmm........

What does "牛後の紅茶" mean?

I can't understand it.(´・ω・`)

lol