I tossed the water balloon and it landed smack-dab on the top of his head.
smack dab
Turkish pronunciation
smäk däb
Pronunciation
/ˈsmak ˈdab/ /ˈsmæk ˈdæb/
Etymology
[ 'smak ] (noun.) before 12th century. Middle English, from Old English smæc; akin to Old High German smac taste and probably to Lithuanian smaguris sweet tooth.