To guarantee that something is true, that it will definitely happen; that it is what it is and you shouldn't doubt it.
Danny: "bro, are you sure she's coming to the dance with you?"

Brandon: "yeah, sharon just texted me– she said she guarandamnteed she'd be here, just running a little bit late."
by mercury_frappe January 5, 2017
I can guarandamntee that $5 FBA (Foundational Black Americans) will come out of the woodworks once reparations come to reality
by chillin662 November 10, 2022