Green’s Dictionary of Slang

noser n.

1. a bloody nose [nose v. (3b)].

[UK]Hotten Dict. of Modern Sl. etc.
[UK](con. 1840s–50s) H. Mayhew London Labour and London Poor I 12/2: The winner is the man who gives the first ‘noser;’ a bloody nose however is required to show that the blow was a veritable noser.
[UK]C. Hindley Life and Adventures of a Cheap Jack 258: It was a ‘noser,’ and no mistake about it, and the ‘ruby’ spurted in all directions.

2. (also nose-ender) a blow on the nose [nose v. (3b)].

[UK]‘Cuthbert Bede’ Adventures of Mr Verdant Green (1982) II 159: I couldn’t go to business properly, or give a straight nosender, nohow.
[UK]Hotten Sl. Dict.
[UK]C. Hindley Life and Adventures of a Cheap Jack 190: Giving the man such a nose-ender that sent him all abroad.
[UK]Sporting Times 14 Mar. 2/2: [They] met a nasty chopping sea, with a nose-ender in the way of wind.

3. (US Und.) an informer [nose n. (1)].

[UK]Cornhill Mag. ii 336: There are a few men and women among thieves called nosers. They are so called because they are in the secret pay of the police, giving information when the information will not lead to the crimination of themselves [F&H].
[UK]Sporting Times 12 May 2/2: From Noser, the Rozzer.
[US]Bentley & Corbett Prison Sl. 36: Noser A prison informant.

4. (US) an interfering person.

[US]Hayti Herald (MO) 27 July 2/3: All the world detests the ‘noser’ - the quiz, the meddlesome, prying person.