WHAT?

Afrikaans

wat?. (various references)

Bulgarian 

та какво от това? (so what?), е та? (so what?). (various references)

Czech

víte co je nového? (guess what?). (various references)

Dutch

wat?. (various references)

French

et quoi après? (and then what?), et puis? (so what?), et alors? (so what?). (various references)

German

wennschon! (so what?), nebbich (so what?). (various references)

Hungarian

na és? (so what?), na és aztán? (so what?), mi köze ehhez? (so what?), hát aztán? (so what?). (various references)

Japanese Kanji 

何何 (such and such, What are the items?, What is the matter?, which), 何々 (such and such, What are the items?, What is the matter?, which). (various references)

Japanese Katakana 

なになに (such and such, What are the items?, What is the matter?). (various references)

Malagasy

maninona. (various references)

Manx

C'red?, Cre?. (various references)

Pig Latin

at?whay.(various references)

Portuguese

que?. (various references)

Romanian

ei? (and so what?, Well?), şi? (and so what?). (various references)

Scottish

dé (what), ce (how?, why?). (various references)

Spanish

cuál? (which?), cómo? (how?). (various references)

Swahili

nini?. (various references)

Swedish

än sen? (so what?). (various references)

Turkish

nasıl? (eh?, huh?, pardon?). (various references)

Ukrainian

ну й що? (so what?). (various references)

Welsh

ai (either, if, is it? what?, or). (various references)