The stage where a males phallic organ is enlarged to halfway "there" but not finished. Handy when diving into pools with loose pants or being pantsed in public.
Jessica Alba announced she will appear topless in her next film; I for one already have a semilobon.
by TheGreenFox July 27, 2008
the male penis is semi-erect :)
I got a semi lob on over jennifer lopez
by Stinkey July 09, 2003
a semi lobon can be gained by lookin at something arousing like a dead badger or your mates mum. the resultin is a half erect penis which can be used to beat gypsies or perform wang shapes with
scuba steve gained a semi-lobon then beat a girl unconcious with it
by haimes March 31, 2008