Top Definition
Behaving with intense sexual interest, specifically in men; being horny, lustful, randy, or intent on sexual activity; thinking with your dick/cock.
"That chick at the party last night was so hot!! As soon as I saw her, I was on the 'glan plan.'"

"Oh honey, just ignore those losers! They haven't been laid in months, and now they are all on the glan plan."
by Billy Beck O'Hannity March 29, 2010

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