What is the meaning of Flattop?

A short haircut in which the hair is brushed straight up then cut flat across the top.

An aircraft carrier.

A type of stringed instrument, most often an acoustic guitar, with a flat top (as opposed to an archtop), with strings held in place with pins, and with a complex system of bracing struts on the top.

A grill with a flat cooking surface rather than metal bars.

Source: wiktionary.org