Green’s Dictionary of Slang

1. a braggart, a boaster.

1934

Weseen Dict. Amer. Sl. 188: [College] Loud speaker – A person who is regarded as important or one who regards himself as important.

2. one’s wife.

1933		Ersine Und. and Prison Sl.
1939		Howsley Argot: Dict. of Und. Sl.