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Acronym for 'Just Another Mother-Fucking Arsehole Geo', in common use amongst exploration drillers in particular in the goldfields of Australia to refer to geologists.
"Which Jim? The JAMFAG Jim or JAFFA Jim?"
JAMFAG by blnvs January 29, 2008
Related Words
Sanitary towel, used by menstruating females. Jam = blood, + rag.

Cognate with 'on the rag': menstruating.
She needed to change her jamrag.
jamrag by starflier December 8, 2003
JagFag "Did you see the amazing play the Jags pulled off on the weekend"
Other Guy "No one cares, you're such a JagFag"
JagFag by fingahhroll December 18, 2010
1. The ballsack.
2. The nutsack
3. The testicles
"I was gonna fuck the hell out of Randy but his jambags were cheesey.
jambags by The_Jawbreaker March 13, 2018
(White) People who want to be japanese. Synonym for Wapanese and japfaq.
You japfag get out of here with your cosplay
japfag by aaaaaaaaasd September 25, 2005

Jamwagon 

Derived from the term 'bandwagon', it's used to collectively describe girls who back up one of their own for sometimes no valid reason other than sharing gender. 'On the Jam' is a vernacular phrase for being on ones period.
Bert: Kate told Donald she was on her period and couldn't have sex. Donald, hearing this, told her he didn't want her to stay over that night and left. Ellen called Donald a dickhead after Kate telling her this.
Ernie: Ellen jumped on the Jamwagon.Surprise Surprise
Jamwagon by Short and Curleys March 5, 2011