IBSS 

meaning itchy ball sack syndrome

yesterday i had the worst case of IBSS i was itching my sack all night long

IBSS by mattandanthony June 20, 2009

IBSS 

International Breast Shape Standard.

A global reference standard used mainly for R&D purposes in garment/lingerie industry and medicine.

In Lingerie industry IBSS is the most widely established international breast shape standard referred to for the purposes of new product design.

IBSS by Jess_Houston_TX September 5, 2016

IBSSTL 

IBSSL is an acyrnim. It stands for "Itchy Ball Sack Stuck To Leg".

Bob: Fuck (rubs crotch), IBSSTL!
Marry: IBSSTL? What?

IBSSTL by qwerty732 February 5, 2010