jzkk

Jzkk is a abbreviation for the sunnah & arabic word for جَزَاكَ ٱللَّٰهُ خَيْرًا (and its derivatives).
Its a trendy way to give unconditional thanks for someone's help yet somewhat down-to-earth manner that only Allah rewards the best. Widely used in some islamic universities (such as IIUM, Malaysia).
If you're a muslim, please do share your experiences with the term jzkk.

For more info, google and wikipedia the term.

Jazaakumullahu khairan, bros and sis.