Plaster of Penis 

Semen that accidentally lands on a strand of hair, drying up and coating it, rendering it stiff.

Last night my boyfriend totally ruined my hairstyle and now big chunks are set in Plaster of Penis

Plaster of Penis by simikis October 16, 2007

Plaster of Penis 

British slang
Yet another coined term meaning the contents of the testicles.
However "plaster of penis" is usually too wordy to actually thread into a sentence and so is never often used as a metaphor for come/cum.

"Fredrick the novelist was having enormous trouble including 'Plaster of Penis' into his pornographic literature, as it spoiled the rhythm of his sentence structure."
"Father MacDougall made a tissue sculpture using plaster of penis as his glue."

Plaster of Penis by Stuart Fletcher November 3, 2004