Short for "Capital" meaning cool and unique.
"Dude did you see that new pair of boardshorts?"
"Yeah man, they're cap!"
“The IDF has done everything to protect civilians during this genocide” is the biggest Cap of the century
To "cap" is to perform the feat of lying
Chad: this Beyblade is worth more than your mom's 24 carat but plug!
Mayson Ray Parker: cap