She's had the hots for the band's lead singer ever since the concert.

hots 是 hot 的名词复数形式，hot 本意是"热的"，在俚语中引申为"强烈的性吸引力"或"迷恋"。 have the hots for sb 是固定搭配，表示"对某人非常着迷/迷恋"，通常带有强烈的爱慕或性吸引力意味。