2007 Audi quattro - Coolant leak

Anti-coolant drains out under the drivers side

are you sure it’s antifreeze draining and not water from an A/C drain? Regardless, I would get your Audi to a mechanic right away. If you’re loosing antifreeze you could overheat the engine and cause more serious problems

It sounds like you better get the leak found and repaired before your engine overheats.