When a female swings from a pre-designated height, into the genitalia of her male partner. Usually of African descent, a scream or holler may be included.
"Dude, where were you last night?" "Sorry man I was with my girl. She pulled the primal swing and we were screaming all night long."
by Daddydankmemes June 21, 2017
by Baer4453 June 30, 2009
An "obvious" type of evidence that proves that someone has reverted back to his "early species" mindset.
The ease that Geico had in finding a number of cavemen for their auto-insurance ads is primal facie evidence that there are still plenty of "un-evolved" hominids among us.
by QuacksO June 25, 2019