All of them were top heavy and fell over if you got off without holding on.
"Float her now and see whether she is top heavy," said Steve.
Traffic in intoxicating liquors and drugs for the purposes of sustaining a top heavy administration.
This high center of gravity tends to make the beam "top heavy," or in unstable equilibrium.
The length of the barrel does not make it top heavy, as the barrel is fluted, to lighten it forward, and the stock weighted.