Contrary to "Hop on Among Us", "Wanna hop on Among Us" is a slang term, begging for rough sex of any kind. The functioning difference is that "Wanna hop on Among Us" can be used in a heterosexual context and is mostly used by females.
Woman: Hey, Baby. Wanna hop on Among Us with me later? *Secretly wanting to be slammed into the headboard*
Rough gay sex after taco bell lasting 24 hours with the semen and diarrhea mixing together creating a cheesy like substance mostly used as a joke among teenage boys