Three common senses to keep apart: (1) job-fit —
专业对口 (your job matches your major) is huge in Chinese career talk; (2) performance-pair —
对口相声 (duìkǒu xiàngsheng) is the two-person form of
相声 cross-talk comedy; (3) palate-fit —
这道菜很对口 means 'this dish suits my taste'.