Idiom: be my guest
Example 1:
Matt: Hey man, I’m going to San Diego next year.
Dee: Oh really?
Can I come too?
Matt: Be my guest.
Dee: Really? That’s awesome.
Example 2:
Thomas: Do you think I can turn in those reports on Monday of next week?
Charles: Be my guest. They’re not due until Tuesday anyway.
Meaning: "Be my guest" means:
“go ahead,” “help yourself,” or it could mean giving someone permission to do
something. It’s a neutral term used by
many people in formal or informal settings.