Sly Stiff
An erection acquired against one's will, usually at a very inconvenient time.
Guy #1
"Oh my, look at ol' Brett Hallacy. What a bulge!"
Guy #2
"Looks like he just popped a sly stiff!"
"Oh my, look at ol' Brett Hallacy. What a bulge!"
Guy #2
"Looks like he just popped a sly stiff!"