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"

Tippy-knee by WORDS MADE BY US January 12, 2018

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 knees by LemmeF1ndOut October 8, 2020