Rir is short for "roten i röven" (swedish) translated into "the root in the ass". Rir referes to deep analsex and are a internet term.
by karl svante October 18, 2006
by Soyokaze October 24, 2008
Acronym: representing Rest In Retirement. Used to signify to "death" of a professional athlete's career. Comes from RIP, signaling the end of someone's life. RIR is the signaling of a pro's athletic life.
by Aaron Sanders October 28, 2006
by jnaylor22 October 27, 2014