Endo

"There are two genders, man and woman. It's eighth grade biology." "Me, I'm glad my endo didn't stop at eighth grade biology."

Source: tatoeba (11596071)

rollin' down the street smokin' endo / sippin' on gin and juice

Source: wiktionary

So as I drive home / I roll my window up / And my endo up in the same motion

Source: wiktionary

Midway down a winding descent on a dry, rocky trail during a mountain bike race in Maui, I tried to avoid a large rock, jammed on my front brakes and went flying over the handlebars – a judo-style fall known as an "endo". […] To avoid future "endos" on precipitous descents, I stood with my weight over the rear wheel, gripping the seat with my thighs.

Source: wiktionary