trumpeter, n. — Green’s Dictionary of Slang

trumpeter n.

1. one who belches or breaks wind.

1656		J. Cotgrave Wits Interpreter 328: Trumpeter [...] He that belcheth either backward or forward.
1674		Head Canting Academy (2nd edn) n.p.: Q. Who is Trumpetter? A. He that belches either backward or forward.
1700		‘The Art of Drinking’ in Wit’s Cabinet 137: He that belches or farts much, Trumpeter.

2. one who has bad breath [to play the trumpet one needs ‘strong’, here ‘bad’ breath].

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: He would make an Excellent Trumpeter, for he has a Strong Breath; said of one having a foetid Breath.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

3. a general term of affectionate address.

1902

H. Baumann Londinismen (2nd edn).

one’s trumpeter is dead [‘He is therefore forced to sound his own trumpet’ (Grose, 1796)]

said of a braggart, a self-advertiser.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Trumpeter. His Trumpeter is dead, or, he is forced to sound his own Trumpet. Saying of any one that praises himself.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.