Nigeria chà-khi (Eng-gí: Nigerian scams), mā thang hō 419 chà-khi, sī chi̍t khoán chà-khi (chà-phiàn, phiàn-kio̍k) hêng-sek.

Nigeria chà-khi bô it-tēng kap Nigeria ū koān-hē, i ki-pún ê sêng-hun mā kiò sìn-jīm phiàn-su̍t. Chú-iàu sī phiàn kóng beh pun chi̍t pit chîⁿ hō͘ pī-hāi-chiá , m̄-koh tāi-seng iau-kiû pī-hāi-chiá la̍p chi̍t kóa só͘-hùi, nā pī-hāi-chiá khak-si̍t hō͘ pián--khì, pián-sian sòa--lo̍h-lâi to̍h ū khó-lêng koh pian chi̍t liân-sòa sin lí-iû lâi thó chîⁿ.

Í-chá Nigeria chài-khi sī lī-ēng phoe-sìn chiap-chhio̍k pī-hāi-chiá. Bāng-lō͘ hoat-tián liáu-āu, chá-kî sī lī-ēng e-mail, che mā sī "Nigeria" chi̍t-ê miâ-hō sán-seng ê pōe-kéng, in-ūi pián-sian tiāⁿ phiàn lâng kóng ū Nigeria ê chu-kim iā sī ka-tī sī "Nigeria Ông-chú"; nā "419" chit-ê sò͘-jī sī tùi Nigeria chà-khi-chōe hoat-lūt pian-hō 4-1-9 hō--lâi-ê.

Āu-lâi koh hoat-tián ēng siā-kau ho̍k-bū phì-jû Facebook ia̍h Line téng mn̂g-lō͘ phiàn chîⁿ.

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Chit khoán chà-khi ū chi̍t khoán kó͘-chá hêng-sek kiò "Se-pan-gâ Kaⁿ-siû" (Spanish Prisoner).