I wanna go out with my friends for lunch... What should I tell to my parents

I've already gone like 2 times in the last 2 weeks...

What reasons should I give what lies can I say to leave my house to go eat,

The previous two times I've said my friend is leaving the country so he asked me to meet him a final time, so I've said that two times, once saying only he and I are meeting and once all our old friends are wishing him a good bye...

What reasons should I give now?