This technique refers to being fellated while sitting on the shoulders of an overweight girl (crotch to face), holding onto her ears and jiggling up and down like an ecstatic simpleton.
Among others, this sexual exercise is also known as Big Momma's Bouncy Castle, Standing On The Shoulder's Of Giants, The Testi Trampoline and Akabusi's High Jump.
"See that big lass over there? We did The Space Hopper last summer in my grandmothers back garden."
"She was so happy I proposed, she let me do The Akabusi High Jump right there in Akbar's curry house!"