Dictionary:

weenie

  (wē'nē)

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1. Informal. A wiener.
2. Slang. A person, especially a man, who is regarded as being weak and ineffectual.

American name for small sausages, abbreviation of wienerwurst.

1. [on BBSes] Any of a species of luser resembling a less amusing version of B1FF that infests many BBS systems. The typical weenie is a teenage boy with poor social skills travelling under a grandiose handle derived from fantasy or heavy-metal rock lyrics. Among sysops, the weenie problem refers to the marginally literate and profanity-laden flamage weenies tend to spew all over a newly-discovered BBS. Compare spod, geek, terminal junkie, warez d00dz.

2. [among hackers] When used with a qualifier (for example, as in Unix weenie, VMS weenie, IBM weenie) this can be either an insult or a term of praise, depending on context, tone of voice, and whether or not it is applied by a person who considers him or herself to be the same sort of weenie. Implies that the weenie has put a major investment of time, effort, and concentration into the area indicated; whether this is good or bad depends on the hearer's judgment of how the speaker feels about that area. See also bigot.

3. The semicolon character, ; (ASCII 0111011).

The noun has one meaning:

Meaning #1: a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll
  Synonyms: frank, frankfurter, hotdog, hot dog, wiener, wienerwurst