Semi Lob on 

the male penis is semi-erect :)

I got a semi lob on over jennifer lopez

Semi Lob on by Stinkey July 9, 2003

semi-lobon 

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

semi-lobon by haimes March 31, 2008

Semilobon 

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.

Semilobon by TheGreenFox August 21, 2008