시큼한 is a descriptive adjective that means 'sour' or 'tangy', often used for food and drinks, but rarely applied to a person in your typical love song.
In the lyrics, ATEEZ sings "시큼한 type, 자극" (sour type, a thrill), playing off the 'lemon drop' theme to describe a love interest whose personality is sharp, exciting, and irresistibly stimulating. It's a fresh and sensory way to capture the electric, complex pull of attraction, like tasting something sharply sweet and sour at the same time.
“Lemon Drop” fizzes with the sweet-and-sour rush of a summertime crush. Over a neon beat, ATEEZ locks eyes with their muse and everything else fades out: “Ain’t nobody… you know you’re the hottie.” The lyrics compare this irresistible pull to a lemon drop and a tequila sunrise, two drinks that are equal parts sugary, tangy, and instantly refreshing. Heartbeats speed up, alarms blare (“Emergency, emergency”), yet the mood stays playful as they chase each other through a night of fine dining, film-worthy moments, and dance-floor heat.
Ultimately, the song celebrates living in the now. As the chorus urges “closer, a little more… stay up all night ’til sunrise,” we feel a cocktail of bold confidence, youthful thrill, and breathless desire. “Lemon Drop” invites listeners to taste love’s electric spark—sweet enough to savor, sharp enough to remember—while the sky shifts from dusk to dawn.