Be my guest means please go ahead and do it. Be my guest, help yourself, well, be my guest.
It grants permission generously, but the tone can turn it into a dare. Said to somebody about to attempt something unwise, be my guest is not encouragement at all.
1phrasebe my guestPlease go ahead and do it.
“If you want to tell him yourself, be my guest.”
be my guest is a phrase.
Practised in Small Talk & Everyday Phrases