Definitions by Merriam Webster’s Husband

Geertsen

The act of randomly squeezing a man’s hard penis, typically done by a horny female.

Sally was so excited to see Randy, she randomly squeezed his penis so hard, he yelled “Geertsen!”

The act of randomly squeezing a man’s penis when erect, typically done by a horny female

Sally was so excited to see Randy’s, she squeezed his penis so hard, he yelled “Geertsen!”