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He was buzzing my door.
I googled 'buzz the door' and it says it means 'To remotely and electronically unlock a door for someone'. But the speaker didn't mean that.
So, maybe 'buzz one's door' means 'unexpectedly drop by one's house'?
(My native language is not English. Please be kind to me. :-))
to buzz OED
to phone or signal (a call or message) by the ‘buzzer’
In this case, it is similar to ringing a doorbell. Likely, one is signalling your door, wanting attention.
