A safety shaft is an alternative to a car seat. All you need is a dick and a bit of motivation. When there is no seat available, head for your safety shaft.
USAGE: Noun; proper noun when speaking to a professional about their Dingle Shaft (less common use).
DEF: The bulk of penis shaft that does NOT include the head (or glans), nor the satchel of the Male genitals. This is the main veiny area that is generally squeezed pounded and tugged upon during masturbation sessions.
HER: Where did you say mygooch is located, Honey?
HIM: You need a dingle shaft to find the gooch, bitch. You'll find that under my purple knob.
Me: Hey man, did you buy the golden shaft?
Friend: Yeah, I'm an affluent millennial with a 100K yearly salary - of course I did!
Me: Wow, that's pretty good man!