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1.
Something that isn't good.
Emma: I couldn't get served it that shop without ID.
Ellie: That's a bit bellendish!
by elliethesicko July 18, 2009
 
2.
1) of the bellend

or

2) Something that is so ruling, that nobody can even f*ing believe how ruling this thing can be.
I just got a serious double full lookback. I think that chick wants to get bellendish.
by Dental January 09, 2004
 
3.
1) Like a bellend, see bellend
2) Very good.
This club is like Mr. Kipling, exceedingly bellendish.
by r-neg October 29, 2003
 
4.
very, very good
Neglia in S.F.
by BB Nominee January 09, 2004