While pleasing a girl, to stick your thumb out like a hitchhiker and plug it up her vagina. Very simple yet effective.

the thing that you don’t have when you’re phones percentage is over 20

4 in the pink, thumb in the stink. Fist her with your thumb in the stink.

When you borrow your friend's shorts/pants after he had just jerked-off in them. You are now harboring a "hitchhiker"! You then go home to your wife/gf and do the dirty, 9 months later you have a kid fathered by none other than... Your best friend!

When you are with a female and you are giving her oral and you realize that she would rather rub one off herself. You proceed to allow her to rub one off while you extend your thumb and stick it in the vagina while she is rubbing so that you can feel all the goodness during her orgasm.