Phrase made popular by internet celebrity 'Dapper Laughs' in his Snapchat stories. Doesn't really mean anything, but is a phrase to express joy at a large number of ladies who are about to get moisturised.
Dapper Laughs: "So many ladies out here tonight, it's a wagwan in a mandem!"
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Street translation of, 'What's going on?' and a collective expression of disapproval
What do you mean our table isn't reasdy? Wagwan in a mandem!?
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When a roadman (preferably over lvl 203) says you have got some nice or βpengβ shoes or βcrepsβ
You (a new roadman lvl 1 with your mandem):Oi blud!
Little T(an experienced lvl 999 roadman with his mandem):Oi wagwan Mandem youve got some peng creps fam!
You:Thanks fam i be rocking these bare timbs!