Pronounced as six-oh-nine-er, it is slang used to call people who are over the age of 70 having casual sex with people of all ages.
Josh: Dude what's wrong?
Travis: God I just found out my grandpa is a 609er!
Josh: Seriously?
Travis: Yeah! He slept with my friend Betty!
Travis: God I just found out my grandpa is a 609er!
Josh: Seriously?
Travis: Yeah! He slept with my friend Betty!
by dontuseyourrealnamemyass December 09, 2019