Ma'anar ƙamus na "kaifi kaifi" (wanda kuma aka rubuta "cardsharp") mutum ne wanda ya kware sosai wajen buga katin, musamman wajen yin magudi a wasannin kati. Ana amfani da wannan kalma sau da yawa don bayyana wanda ya kware wajen sarrafa katunan da yaudarar abokan hamayya don samun kuɗi ko wasu kyaututtuka. Yawan kati yana da alaƙa da caca kuma yana iya amfani da dabaru iri-iri don yin zamba, gami da sleight na hannu, alamun katunan, da haɗa baki tare da wasu 'yan wasa. Hakanan ana iya amfani da kalmar "kaifi mai kaifi" a ma'ana ta gaba ɗaya don siffanta mutumin da ya ƙware sosai ko ƙware a wani yanki ko fage.