Green’s Dictionary of Slang

bloomer n.2

[blooming adj.1 + SE error]

1. [late 19C-1910s] of an individual or object, a fake, a fraud.

2. [late 19C+] (orig. Aus.) an error, a slip; usu. in phrs. go/make a bloomer, come a bloomer.

3. [20C+] a complete failure, a disaster; thus pull a bloomer, to be a complete failure.

4. [1910s] (US) a joke; thus pull a bloomer, to make a joke.

5. [1910s–50s] (US Und.) a safe that proves to be empty.

6. [1920s] (US) something or somewhere valueless.