used as a substitute for the letter m
m looks like rn, how coincidental.
by sugarbuzz November 02, 2009
Meaning 'rocket nipple'. When a girl is cold/wet/horny and you can see the outline of her hard nipples protruding from her shirt.
yo dawg get your fly ass on over hizzle and check out the RN on that brod. Dont you want to squizzle that bro? its mint.
by Sean April 14, 2004