From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flasher \Flash"er\, n.
1. One who, or that which, flashes.
[1913 Webster]
2. A man of more appearance of wit than reality.
[1913 Webster]
3. (Zool.)
(a) A large sparoid fish of the Atlantic coast and all
tropical seas (Lobotes Surinamensis).
(b) The European red-backed shrike (Lanius collurio); --
called also flusher.
[1913 Webster]
4. An exhibitionist[1], especially a male, who briefly
exposes his private parts in a public place.
[PJC]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flusher \Flush"er\, n.
1. A workman employed in cleaning sewers by flushing them
with water.
[1913 Webster]
2. (Zool.) The red-backed shrike. See Flasher.
[1913 Webster]