This Chinese proverb means to crave something, to desire it and this proverb although could be taken to mean to literally salivate. I prefer the meaning to have a strong desire or craving. 'to drool over'.

垂涎三尺
chuí xián sān chǐ
To drool over

The picture depicts my desire to get to China, and the celebration that will ensue. One of my goals is to spend Chinese New Year in China at least once.