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4.
To have poisoned insects or critters. Derived from a trademark named insecticide.
Yolanda blackflagged her crabs with lindane.
by harry flashman July 10, 2003
2 6
 
1.
to do something fucked up or wrong. Usually followed by someone waving a small black flag and the words "You done fucked up, son"
Tynise black flagged when she texted the wrong person. Twice.
by DistructiveHamster September 15, 2013
7 0
 
2.
Getting really wasted and fucking up all night long usually with a big group of friends.
Mark was chugging four locos when he got up and shoved Christian hard on the toilet.He was so black flagged.
by Myersgirl November 02, 2013
1 0
 
3.
a strong suggestion to avoid a person at all costs.
Behind Susie's back Wilkie formed the two-fingered x sign above her head - blackflagging her in no uncertain terms to Jimmy who had approached unsuspectingly with the intention of spading her.
by angela June 06, 2003
3 2