An infinicummer is someone who stays hard after cumming several times. Beings like these are beyond mainstream understanding.
Björn: Oh god.
Tomáš: What's up dude?
Björn: Last night I "did it" with Olivia and I stayed hard after cumming 5 times.
Tomáš: Wow! What's she think?
Björn: She called me an "infinicummer".
Tomáš: Whoa, tell me how you do it.
Björn: Well, uh...