It simply means.."잠시만요(jam si man yo)"
There are some other versions.
(All are the same in meaning^^)
1) 잠시만 기다려 주세요 - formal and polite
2) 잠깐만 기다려 주세요 - less formal than 1) but still polite
-------(informal versions)
3) 잠시만요 - informal and polite.
4) 잠깐만요 - more informal than 3) and still polite.
-------(impolite versions)
5) 잠시만 - informal and impolite.
6) 잠깐만 - more informal than 5) and impolite.
All are often used in conversation but if you are confused about or don't know which one you should use, just take "잠시만요(polite)" or "잠깐만(impolite)".^^
1) 잠시만 기다려 주세요 - jam si man gi da ryeo ju se yo
2) 잠깐만 기다려 주세요 - jam kkan man gi da ryeo ju se yo
3) 잠시만요 - jam si man yo
4) 잠깐만요 - jam kkan man yo
5) 잠시만 - jam si man
6) 잠깐만 - jam kkan man
^_______^