Actually, three jolly boys sang it. Taking verse one as an example:
(Jolly Boy No. 1) Your courted a fair maid
(No 2) Aye sir aye
And you did the same sir
(No. 3)No sir no
( No 2)He did did he not
(No 1)He bloody well did
(No.1 & No 2)He cannot deny it sir
(Nos 1, 2, 3)No, sir, no