When a move goes from "inconsistent gimmick" to "must-block-stand" in a single patch, the wiki traffic spikes. That spike is what people call the "hot" period.

Jack-O' Valentine is a high-complexity technical rushdown character in Guilty Gear -Strive- who relies almost entirely on her to function effectively . While she is rated as an A+ tier character on the latest Dustloop Tier List , she is widely considered one of the hardest characters to master due to extreme execution requirements and "unstable" momentum. Playstyle & Core Mechanics

: Servants are your lifeblood but are fragile—they disappear if Jack-O' blocks a hit. Learn to cancel normals into minion commands like to maintain momentum. Essential Moves & Commands Summon Servant 214P (Hold OK) The foundation of her kit; can be held to delay release. Servant Shoot

. She might be difficult to pick up, but once you master her minions, you'll be the one controlling the pace of every match. or a guide on her Servant commands GGST - Jack-O Overview - Dustloop Wiki

You're referring to the Jacko Dustloop hot, a popular Australian-style hot water system!

One cannot discuss Jack-O’ without the —a technique documented on Dustloop’s “Tech” page. By Roman Canceling the startup of her Servant Summon during a super jump, Jack-O’ can summon minions in mid-air, creating unpredictable angles of attack. This advanced tech, while execution-heavy, demonstrates how Dustloop serves as an archive for community-discovered optimizations. Without such resources, Jack-O’ would remain an impenetrable cipher; with them, she becomes a deep, rewarding character for lab monsters.