Tippy knees

The act of elevating to the tallest point possible while on your knees.

Stephanie while providing sucking privilege had to get on her tippy knees in order to get my entire shaft down her throat.

Tippy-knee

When your girl is shorter than you by a lot and she has to tippy-knee (Tippy toe but for knees) in order to suck you off.

"c'mon baby you can do it just Tippy-knee it"