(Verb) In regards to bartering and trading, the term "lowball" is used by greedy sellers who don't understand depreciation and are attempting to make a buyer lookbad.
Guy 1: That guy just tried to lowball me
Guy 2: Maybe you should read Economics for Dummies
In online gaming, the act of waiting for your teammates to injure an enemy player then striking the killing blow at the last minute. See also: Kill Stealing
Dammit, Johnny just low-balled me again! He's got 6 kills and 23 damage dealt this round!
A guy that comes to your yard sale real early, sees your 1989 Nintendo plus 50 games and offers you $5 for the box. Walks around the sale picking up everything expensive asking "Would you take $1 for this? How about $.50???". Then when they go to pay they hand you a $20 dollar bill for $3 of stuff!!!
The guy probably stores it all in a shed and sells it all on Ebay.
That Fuckin Lowball Lonnie offered me $1 for my $90 TICalculator!!!!
Every time I have a yard sale a Lowball Lonnie shows up at 5am with $3 to spend.