This is a children's song that teaches spelling and rhythm.
You sing B-I-NGO the first time, then drop the first letter and clap on it the next time:
clap-I-NGO, and keep dropping letters throughout the song.
G / / / | C D G /
G / Am / | D7 / G /
Em / C / | D7 / G /
There was a farmer had a dog and
Bingo was his name-o
B-I-N-G-O B-I-N-G-O B-I-N-G-O
and Bingo was his name