Source : Webster's Revised Unabridged Dictionary (1913)

Blub \Blub\, v. t. & i. [Cf. {Bleb}, {Blob}.]
   To swell; to puff out, as with weeping. [Obs.]

Source : WordNet®

blub
     v : cry or whine with snuffling; "Stop snivelling--you got
         yourself into this mess!" [syn: {snivel}, {sniffle}, {blubber},
          {snuffle}]
     [also: {blubbing}, {blubbed}]