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1.
A person whose face is paralyzed on one side. This is most noticeable when the forsythed person smiles, and only one side of their mouth goes up.

Often caused by a stroke or untreated ear infections.

Also related:
forsythed, forsyther
Is that person wasted or are they just a forsythe?
by SpokaneHo January 13, 2012
 
2.
The act of fornication or any attempted sex act.
Did you forsythe last night with crystal?
That forsythe was the best forsythe of my life!
by doobie23456 January 10, 2010
 
3.
1. similar to the shocker, although, while sucking a guy off, inserting your fist into his anus, and wiggling your fingers around for hightened pleasure.
"Last night Coreys mom gave me an awesome forsythe, she got a huge load on her face"
by Big Jerms July 27, 2005