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1.
a term used (not necessarily in a derogatory manner) to describe the lineup of Van Halen when Sammy Hagar was the lead singer and rhythm guitarist of the band (1985 - 1996 and again in around 2003 - 2005).
In 1985 Van Halen got the nickname "Van Hagar" for obvious reasons. The following year I saw Van Hagar live in concert on the 5150 Tour. I think the band was at their commercial peak at that time. 5150 was the band's first #1 album, and of all those VH albums that reached the top it's the best.
by Starpunk February 18, 2008
 
2.
A rather negative term used to describe the period of time in which Sammy Hagar dominated as the lead singer of Van Halen. This period of time spans from their album "5150" to present day Van Halen. Hagar took over the lead singer's role when David Fucking Lee Roth walked out on the rest of the band shortly after "1984". Although the Hagar albums are quite different from the Roth ones, they still kick major ass. Van Halen's next album should release early this summer. Hagar owns you all.
Van Halen or Van Hagar, they own either way.
by EVH February 17, 2005
 
3.
Van Halen during the Sammy Hagar Days
Van Hagar sucked ass, I liked them better when they were Van Roth!
by VP-bofh January 26, 2004
 
4.
Term referring to the period when Sammy Hagar almost ruined Van Halen.
"Van Hagar sucks"
by Joe Bastard February 28, 2004
 
5.
Term used in a negative context to refer to the band, Van Halen after there lead singer, David Lee Roth left the band in 1985 and was replaced by Sammy Hagar. This is negative because many fans of the band dislike Hagar.
Without Roth, all that's left is stupid Van Hagar.
by SeanMurface April 08, 2006