(as) mad as a hatter
US /əz mæd əz ə ˈhætər/
UK /əz mæd əz ə ˈhætər/

1.
疯疯癫癫的, 完全疯了
completely crazy or insane
:
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My uncle has always been (as) mad as a hatter, always coming up with the wildest ideas.
我叔叔一直都疯疯癫癫的,总是想出最疯狂的主意。
•
After working non-stop for three days, he was (as) mad as a hatter.
连续工作三天后,他已经疯疯癫癫的了。