Archaic honorific term for one's own or someone else's uncle. In modern Japanese, おじさん or おじさま are used instead.
In old documents it is written as 伯父御, but nowadays it is normal to say おじさま.
Archaic honorific spelling for uncle; 伯父 indicates an older uncle (parent's older brother).
Archaic honorific spelling for uncle; 叔父 indicates a younger uncle (parent's younger brother).
Combination of 伯父/叔父 (oji, 'uncle') with the archaic honorific suffix 御 (go). The exact historical derivation is uncertain.