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1.
To strip someone of his/her virginity.
1. Don't blabber just because he ploughed your queen.

2. Sid ploughed his neighbor last weekend.
by babakaashirwad December 24, 2012
 
2.
The physical and mental state of someone who is under the effects of an illegal drug
for example cannabis
"Wow Dave is so ploughed today"
by TheRainman January 25, 2009