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1.
When a teacher's (or anyone for that matter) glasses are so thick that it appears they're made of fiberglass.
We could barely see her eyes peering through those fiberglasses.
by J.Robbins January 21, 2007
 
2.
Stronger than steel.

A material when launched at over 300 mph can penetrate and destroy Steel columns.
Orlando: 911 showed that fiberglass can cut through fucking steel.

Me: Super Man is nicknamed man of steel, should be man of fiberglass because thats apparently tougher than steel.
by rickya209 May 16, 2014