Pluger

[vada2022]

I'd like to know what "Plunger" (Boy Plunger) could mean in this context. Does it mean he bets everything or he is a short-seller?

Jesse Livermore used to bet huge, which is how, as a teenager trading in the ‘bucket shops’ of Boston, he acquired the nickname Boy Plunger. It’s also how he went from being penniless to being one of the richest people in the world...

[geevo41]

See last definition

plunger
[ pluhn-jer ]SHOW IP
noun
Machinery. a pistonlike reciprocating part moving within the cylinder of a pump or hydraulic device.
Automotive. a pistonlike part in the valve of a pneumatic tire.
Also called force cup, plumber's friend, plumber's helper. a device consisting of a handle with a rubber suction cup at one end, used as a force pump to free clogged drains and toilet traps.
a person or thing that plunges.
a reckless bettor or speculator.

[vada2022]

Thank you so much.