Chump blocker

A chump blocker is a (generally small) creature assigned to block a larger attacker, which will ultimately die at end of combat and the blocking is solely done to prevent the damage that would be dealt if the creature was unblocked. Chump blocking occurs most often by players who are losing and trying to gain additional turns in which to draw answers. Alternatively, they may have evasive attackers that do less damage a turn but aren't chump-able, or by players with some method of generating large quantities of blockers to indefinitely stall an attack. This sort of blocker is most commonly a creature token.

A chump attacker is a somewhat rarer phenomenon where the attacker has enough power over multiple creatures that they accept losing their "best" — but usually still bad — attacker to a good blocker to deal a large amount of damage.

Trivia

"Chump-Blocking Orphan" is the name one of the "cards that did not make it" in the Unhinged hidden message from the words at the bottom of the cards.