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1.
When the blood rushes to the face because you are highly humiliated.

It's typically Northern Irish and if you get one, you'll know about it. Some wee millie or spide is bound to say, "oh mo -iy luuuud your redner, scundered" - wee fuckers
I fell outside the shap in front of jantie and had a big redner.
by Lemmalola June 22, 2005