Suicide ganking refers to the practice of intentionally attacking enemies in high-security space, with the expectation of losing one's ship to Concord. Some targets have very valuable items equipped and/or very valuable items in their cargo, and killing them and recovering the items that are dropped will pay for the costs incurred in losing the ships necessary to kill it. Concord response times are longer in lower-sec systems, so suicide ganking is generally most profitable in 0.5.
For example if a Badger transport ship is carrying an item worth 1 billion ISK, Someone could organize a fleet of 10 high- damage catalyst destroyers ( 10 mil each) to gank it. Even though the attackers lost 100 million ISK, they gained almost 900 million ISK.