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Prolly
Prolly
RD.COM

Prolly is taking over for probably in text messages, but its origin goes back much earlier: the 1940s. Considered a “relaxed pronunciation contraction” (like gonna and outta), prolly even shows up in the Oxford English Dictionary. But you should definitely only use prolly informally, as in: “U prolly don’t like that I said prolly when u asked me to marry u.”