If I do say so myself is an expression which means that a person is praising his own work by referring to his own opinion as an insurance of quality.
While the phrase reeks of confidence, it can also come off as bumptious and arrogant, so it is important to use it cautiously given the double standards of the term.
Due to its simplistic nature, the origin of this phrase is currently unclear.
Some linguists believe that If I do say so myself began circulating in the English language during the 18th century.
However, where the term exactly traces back is still yet to be discovered.
Presumably the most famous use of this particular idiom is in the 2013 song of Beyoncé featuring Jay-z, called Drunk in Love.
Another appearance of this phrase is on television, in the 2017 animated film My Little Pony: The Movie.
Internet meme culture also implemented If I do say so myself into its own skillset, depicting the expression on various images, most commonly on pictures making fun of snobbism.