Rose City Til I Die means that you follow the Rose City, specifically the Portland Timbers and would never support the Shittle Flounders even if Portland doesn't have a team.
Tool: "Hey you going to see the X-box team play up north?"
Me: "Hell NO RCTID you whalefucker!"
Rangers 'til I die - the state of being a loyal fan of a team called Rangers (Glasgow, QPR) with so much passion that you'll support them until your death.
Boy 1: Hi, I'm a Chelsea fan Boy 2: Get out, I'm RTID!
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.