Want (something) so bad (that) (one) can taste it slang
To have a desire for something to an extreme degree
My little brother wants the art prize so bad that he can taste it.
When I reached the age of 19, I wanted a car so bad that I could taste it.
A desire to do something, which is random, sudden and unaccountable
To long for something/ to do something
Believe or act in accordance with your desires, usually in spite of the wants or feelings of others
Used to emphasize one's interest or eagerness to have or do something
The verb "want" should be conjugated according to its tense.
It was often said by a photographer when he would like small children to look at the camera and smile before he took a photo.
When the photographer said “watch the birdie”, all of us looked at the camera and smiled.