and how!
used to say 'yes' strongly in reply to a question

[TahlilGaran] Dictionary of Contemporary English ▲

and how
I agree very strongly.
“That was a great game last night.” “And how!”

Usage notes: usually used as a separate sentence, as in the example

[TahlilGaran] English Idioms Dictionary ▲

And how!
[American & Australian]
something that you say in order to emphasize that you agree with what someone has just said.
'It was a great game last night.' 'And how!'

[TahlilGaran] English Idioms Dictionary ▲

and how
interj., informal Yes, that is certainly right!
■ Used for emphatic agreement.
"Did you see the game?" "And how!"
"Isn't Mary pretty?" "And how she is!"
Synonym: YOU BET, YOU SAID IT.
Compare:: BUT GOOD.

[TahlilGaran] English Idioms Dictionary ▲