A sabertooth is when you're in bed with a hot lady and you make the "sign of rock" with your thumb over your fist and your pointer and pinky fingers pointed upwards. After wetting them liberally, you forcefully yet gently thrust your pointer finger into the woman's vagina and your pinky finger into her anus. More of a playful signal of your spontaneous sexual manner than a bona fide erotic manuever. Also known as "getting your rocks off hardcore-style".
"Holy shit Mike, I totally gave Alice the sabertooth last night!"
"Did she go wild?"
"Fuckin' A she did!"
by SexMan March 01, 2005

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