What does :-S mean?

What?! can be abbreviated as :-S
Other shorthands for What?! are: WIFY, WAGWARN, wazza, WOUM, wassup, w'sup, WAG1, WAGWAN, SUP, WAGWUN, WUB, WIIFY, WIIFT, WA GWAN, WHWN, wad ^, W^, S^, watz ^, wadzup, wats ^, WYF, was^, WANGLYDIAPLT, wats^, WANGLY, WUWY, WTM, WP, WIIFM, w's^, wat's^, WSP, WU, WYS, wuzup, WIFM, 5W2H, wutup, WWWTP, EH, WUH, WHATM, WDC, SW, wup, wuza, WGO, WYRN, WYP, wfhw, Wywt, WYL, SWYP, WYI, SWU, WUWT, WNSD, WIIFMe, YLE, WRG, ZUP, whf, WTP, SNU, WUWU, WFK, WTF, wud, waz ^, WUF, WAZ UP, WIW, WTDB, QUE, WWWY, WTSMG, WATZ, WTD, WUW, WHTOL, WYN, whats ^, wbu, wasup, WFL, WITB, WTMY, wot, ?up, WED, wby, waz^, WYSIWYG, WIAN, WNWY, WGITH, WUB, WU?, WFD, WWWW, SWYP, WN, wats, WUD, WNCL, Wity, WUH, wug, wuba, WFDT, WUD, WNN, WHAT^, WIN, WML, WTFK, WTD, wazz, wtmtr, WNR, WTF, WNII, WWN, WYBD, WNE, WNC, WNTSP, WNC, WNS, ?^, wtbd, WWWT, wtf, WNN, wot, WHW, WNC, WDY, WYPB, WOW, snew, WOMM, WNHW, wtf, WUE, WTC, WTF, WNIC, WTS, WAAM, wyr, wua, wuw, Wii, WTFIT, WITY, wts, WWWM, WYS, WTB, wtd, WTF, WNA, WNY, WTF, WYP, WNIS, Wyb, wrn, WTAA, wox, SWWCFI, wth, wtf, WOIC, WIN, wyf, WNM, WMAA, WMIY, WNIM, w4, WULA, WFFT, wys, WTF, WYL, WTF, WHISAH, WCCK, WEY, WTF, wyr, watt, wtc, wow, ?, WWTG, WOT, wotv, WTDIAB, whw, wuz4dina, WTP, WOW, WTH, wtd, WYR, wnj, swn, WOW, whn, wtf, wc, whn, wh, WYP, wts, wys, wrwa, wtn, wyr, whyb, wyp, wyt, wrh, wyr, what, WACS

Q: A:	What does :-S stand for? :-S stands for "What?!".
Q: A:	How to abbreviate "What?!"? "What?!" can be abbreviated as :-S.
Q: A:	What is the meaning of :-S abbreviation? The meaning of :-S abbreviation is "What?!".
Q: A:	What is :-S abbreviation? One of the definitions of :-S is "What?!".
Q: A:	What does :-S mean? :-S as abbreviation means "What?!".
Q: A:	What is shorthand of What?!? The most common shorthand of "What?!" is :-S.