a very old woman (like 60+) that still goes after young men. A siberian tiger is much older than a cougar, bobcat, or mrs. robinson, probably along the lines of a GILF.
I've been banging this cougar lately, shes like 68.
Bro thats too old for a cougar, shes is a siberian tiger.
The act of riding a bike up someones anus
I'm so sore after Dave siberian tiger'd me last night