Having sexual intercourse while your penis is covered in elmers glue, with sand all over it. It is going to feel rough, like your banging sand paper. (100 grit)
John- "Hey man whats that elmers glue for"
Tyson- "For my sudan sandbox later. Im going to the park to dip my shaft in sand, then i am going to bang Sally."
John- "Thats spank!"