A Yiddish insult meaning a thief, con man, or other such unscrupulous and untrustworthy character looking to conduct a scam, ripoff, or similar evil and dishonest method of personal gain.
The word is an insult. A ganef wouldn't generally call himself a ganef, no matter how proud of himself he was, but he might be angrily called a ganef by his victim.
Bernie Madoff convinced me to put my life's savings into his ponzi scheme. That no-good ganef cost me everything!
1: A dwarvish laugh in a descending tone with the sound 'nyip nyip nyip' or 'nyerp nyerp nyerp', starting with a high pitched 'nyip' or 'nyerp'.
2: An enormous penis
3: The act of ejactulation.
1: Over a glass of meade, it's always nice to unwind and ganderschplaf with friends.
2: When I pulled out my ganderschplaf she couldn't help but feel intimidated.
3: "I'M GONNA GANDERSCHPLAF!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.