It is used for cars and the type of roof they have, the opposite is a convertible as it can change its roof and is not a constant hard top.
by Rex420 January 10, 2022
A construction type hard hat kept in the trunk of an automobile for shit emergencies allowing wearer "no questions asked" free access to tens of thousands of Porta Potties nationwide.
When I wear my emergency hard hat,I can use the Porta-John at any construction site and nobody gives me a second glance.
by wolfbait51 May 23, 2011