The most meaningful submission I've ever hit was when I was a white belt and wanted to compete in provincial championships (qualifiers for nationals). I went there and saw this was all Gi stuff and not No-Gi. I became nervous but kept my cool and I won a fight by an arm-in Guillotine (that does sound phony) he kept on pulling my gi but I was finally able to guard him properly at a 100% and squeezed as hard as I could.
The one that I love is the Arm-bar. It's my bread and butter, My 1st priority is to hunt for the arm and have done that alot in random challenges and rolls.