Literally meaning "of Beirut" in Armenian. Used by Armenians to identify Lebanese Armenians (mostly displaced due to the Armenian Genocide of 1915). Armenians born elsewhere but whose parents were born in Lebanon consider themselves to also be Beirutsi. Lebanese Armenians typically speak the Western Armenian (Arevm'tahayeren) dialect which has undergone several phonetic mergers; these may be due to proximity to Arabic and Turkish-speaking communities. As a result the Western alphabet has serverl letters that produce the same sound (as opposed to Eastern Armenian which is closer to Classical Armenian or "grabar").
A Beirutsi would replace D's with T's (Door/Toor), B's with P's (Lebanon/Lepanon) and G's with K's (Grigor/Krikor). Arabs have similar difficulty pronouncing these letters, for instance pronouncing Pepsi as "Bebsi."