look up any word, like bae:
 
1.
someone that is short and dumb!
Kiara: haley your 4 eight not 4 nine

Haley: no im 4 nine
Taylor: no cause im taller then you and im 4 nine!
Kiara: Haley your so short an aunt walked up to you and said wow im tall!
Taylor: ya thats true your tht small!
Haley: im short and dumb!
Taylor+Kiara+Rachael: your shumb!
Haley: yea im shumb!
by kiki0843 babyy May 12, 2009
 
2.
to shank someone with your thumb
'dude i just shumbed that kid right in the side'

'sweet'
by tristan dobbins April 22, 2008