A Class 8 heavy commercial truck, also known as a tractor, "big rig", or "semi" (for the semi-trailers they haul).... Especially a nice, customized, or "tricked out" example of the conventional, or "long-nose" variety.
'Got my Large Car pullin' a skateboard down the superslab.
by Honor March 22, 2007
A largecar can be any or all of these:

A class 8 semi-truck.

A customized, or "pimped out" truck.

A truck capable of reaching speeds in excess of 90 MPH.
That driver has a really cool largecar.
by Jason Davis July 12, 2007

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