a Manx (cat)

(animation) an inbetweener

(mahjong) a win worth four times of a 満貫 (mangan): 48,000 points if the winning player is on the East (dealer) side or 32,000 points otherwise

(vulgar) pudendal cleft

(golf) swinging with all of one's strength

Isle of Man (an island and Crown dependency of the United Kingdom in the Irish Sea)

a mandrill

walkman (any personal cassette player)

monthly

(slang) a sexually promiscuous woman, a slut / (derogatory, slang) a young woman who acts in lax and sexually suggestive manner