What do two short horn blast from another vessel mean and I meeting?

Two short horn blasts from another vessel typically indicate that the vessel is maneuvering to pass you on your port (left) side. This is a communication signal used to convey intentions in navigational situations, helping to ensure safe passage and avoid collisions. If you're meeting another vessel and hear two short blasts, you should be prepared to give way accordingly. Always maintain a lookout and follow the rules of the road to ensure safe navigation.