Abbreviation for "I Bought New Shoes." Often used during social media communications (ex. texting, tweeting). Allows one to quickly inform contacts that they have bought new shoes.
"OMG ANISHA GUESS WHAT?!?!!? IBNS :DDD"
"So I was online shopping instead of studying as usual and the Ralph Lauren
rain boots I was keeping my eye on was on sale! Next thing I knew, ibns."