An ironic acronym meaning Yet Another Needless Excuse To Abbreviate. Used to mock those who insist on using text shorthand for anything they say, including phrases that are used little if ever.
Tool: ROFL TIL WTF ZOMGPWNSAUCE is inb4 n00b. TSIM, IJS.
Sane person: does it depress you that your only purpose in life is to find yanetas?
Sane person: STFU w/ ur yanetas, SDMS asshole.