Jizz up in its dated slang sense means to excite, hype up, or rev someone into action — the jizz here comes from jazz, not its more contemporary meaning, making this a false cognate that trips people up. It was used in early-to-mid 20th century American slang with the same energy as jazz up: to make something more lively or stimulating.
The coach tried to jizz up the team at halftime but they were already two goals down.
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(slang, dated) To excite or work up (someone).
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.