Another word for "skivvies," which means underwear. Skibbies, if said with an elmo-type voice, sounds especially cute. Usually refers to boyshorts. Can also be shortened to "skibs."
"There's nothing but skibbins left in this bag of chips! Asshole."
"Unfortunately, the payments on his Porsche left nothing but skibbins in his bank account."
"..after the Apocalypse, we were left with only skibs of the world we once knew."