名詞
1990年代好流行嘅鐳射反光貼紙或咭片，上面印有藝人或卡通人物個樣，通常都會分唔同系列，好多具收藏價值（量詞：張） foil trading cards; in the 1990s, foil cards with photos of pop idols and cartoon characters were very popular among young people, and they collected and traded. "閃卡" often refers to the cards in that era
細個嘅時候，我最鍾意去信和買明星閃咭。
细个嘅时候，我最钟意去信和买明星闪咭。
sai3 go3 ge3 si4 hau6, ngo5 zeoi3 zung1 ji3 heoi3 seon3 wo2 maai5 ming4 sing1 sim2 kaat1. When I was young, I loved going to Sino Centre to buy idol foil cards.
名詞
淫照；2008年，藝人陳冠希淫照流出，網民爭相收集當事人嘅淫照，以「閃咭」為代號，後來「閃咭」就成為咗「淫照」嘅別稱（量詞：張） sexually explicit photos; this usage gained prominence in 2008 when nude photos of pop stars in Hong Kong were leaked in the Edison Chen incident. During the incident, the Internet communities used a coded word "idol cards" for the photos of celebrities, so the word has become another name for such photos.
你睇咗陳冠希同阿嬌嘅閃咭未？
你睇咗陈冠希同阿娇嘅闪咭未？
nei5 tai2 zo2 can4 gun3 hei1 tung4 aa3 giu1 ge3 sim2 kaat1 mei6? Have you seen those erotic photos of Edison Chen and Gillian Chung?
名詞
引申指一個不斷推新款式嘅主題，會吸引發燒友好似儲閃卡咁去影呢類相片（量詞：張） a theme that attracts hobbyists to continuously take new photos, adding to the collection
Ｋ君儲緊德國製巴士嘅閃卡，見到呢堆車嘅特見記得call佢影！
Ｋ君储紧德国制巴士嘅闪卡，见到呢堆车嘅特见记得call佢影！
kei1 gwan1 cou5 gan2 dak1 gwok3 zai3 baa1 si2 ge3 sim2 kaat1, gin3 dou2 ni1 deoi1 ce1 ge3 dat6 sin3 gei3 dak1 ko1 keoi5 jing2! Mr K likes collecting and photographing German buses on different routes, so if you see them running on unexpected routes please call him so he could go to take photos of it!