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1.
When a woman wants to have intimate relations with an older man, especially when that man is a cuckolded husband or otherwise less-than-capable partner. Also could be an old, trusty dildo that's well-used.
She was bored with her household chores, so instead chose to slide down the dinosaur.
by biatch'ho August 20, 2009
 
2.
Leave work right at quitting time, regardless of whether you're in the middle of a project -- like Fred Flintstone in the opening sequence of every episode of the Flintstones. (Shouting "Yabba dabba doo!" is optional.)
Clear paper jam? Heck with that! It's five o'clock -- time to slide down the dinosaur.
by Bobby Narco September 27, 2013