It's a common phrase used in Spanish, particularly in Mexico and Latin America. It's often used in a humorous or ironic way to describe someone who comes and goes quickly, or who doesn't stay long.
Here are some examples of how it might be used:
* "He's always come y vete, never staying long enough to get to know anyone."
* "The party was a come y vete affair, everyone just popped in and out."
The phrase can also be used in a more literal sense, for example:
* "Come y vete to the store and get me some milk."
* "Come y vete, I need to use the bathroom."