a not full erection.. it's not limp, not fully hard, it's an in-betweener: see chubby
that girl at the grocery store was so hot she gave me an in betweener
if the wind blows the right way I'll get an in-betweener
n. A turd that has come halfway out, and you don't know whether to force it the rest of the way out or suck it back in.
"I sat down to crap, and all I had was an in-betweener, so I sucked it back in.