flat·top 
(flăttŏp′)
(flăttŏp′)n.
Informal
Informal
1. An aircraft carrier.
2. A short haircut in which the hair is brushed straight up and cropped flat across the top.
3. An acoustic guitar having a flat piece of wood on the side where the strings are, a single sound hole in the center of the body, and a bridge attached just below the sound hole.