Liam Shaw, 19, plummeted from a hotel room at 3.45am on Sunday at Sunny Beach.
Police said he went to his room to get money to pay a taxi that had dropped him off.
But after Liam failed to come back down the driver knocked on his hotel room door, which his girlfriend opened.
Both then heard Liam hit the floor. The impact killed him immediately.
His holiday operator Thomas Cook said: “Our thoughts are with Liam’s family and friends.”
Last week the British Embassy in capital Sofia and cops launched a new campaign to educate British holidaymakers.
Consular staff handled 300 cases last year, including hospital admissions and deaths, caused by Brits binge drinking at the Black Sea resort.