"Get Rekt" is a bit hard to explain. The word "REKT" basically means "Wrecked". These days, people usually use the phrase "get rekt" in MLG videos, which are humorous and a bit weird videos. Well, to sum up, the only way to explain you what "get rekt" means is with examples:
Team A Fan: Today we won Team B 6-0 !!!!
Another Team A Fan: I know really!!! Get rekt Team B!!!
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