薄荷本涼呵必加冰
[bó hé bĕn liáng hē bì jiā bīng]
'Mint Is Cool, But Must Be Served With Ice' humorously plays on the idea that mint leaves are inherently cool (and refreshing), but suggests an exaggerated desire for extra coolness. It can also metaphorically imply someone with a chilly or detached character prefers icy conditions even more.