One would define a sausage clamp as when one's penis (or other phallus shaped object) becomes stuck/lodged in another's orifice, particularly so, when a couple/group has had a considerably vigorous session.
"Oh my god, it was so tight, it definitely sausage clamped me!"
"That cherry pie sausage clamped me."
"I was stuck there for hours, it was such a sausage clamp."
"I've never felt a vacuum like it this is the worst sausage clamp I've ever had"
"OMG she gives a sausage clamp like no other"