Goated with the sauce refers to the acronym G.O.A.T, (Greatest of all time), and with the sauce implies completeness. To be Goated with the sauce is to reach nirvana.
He's bussing it down sexual style? He must be goated with the sauce!
A somewhat inappropriate act popularized in Britain during the mid to late 1700's in which the crotch of a family member is playfully grabbed by a fellow family member.
Dad: Goitcha!
*Dad proceeds to grab his daughter's crotch*
Daughter: DAD! Stop it with the goitcha already!