The act of knocking on someones door before you enter their home. When no doorbell is present it is common courtesy to knock on someones door first, then allow them and greet you before you enter their home. Barging into a persons home is considered rude and disrespectful.
With the exception of douche bags, most people always practice proper knocking etiquette.
by BaconMastert November 22, 2016
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