Terrell Owens -- I Tweet To Pay My Bills!

T.O. filed legal docs in one of his child support cases, claiming he doesn't have nearly enough jack to pay his baby mama's attorney's fees, but in making his argument he revealed he's making a bloody fortune by tweeting.

According to legal docs, obtained by TMZ, Mr. O says he makes between $2,800 - $6,400 per tweet. In one instance, he pulled in $2,800 to tweet for Cutters -- a football glove company. He raked in $4,800 for tweeting on behalf of Old Navy. And he got $6,400 for tweeting about Fantapper -- a sports social networking site.

T.O. also discloses he's earned residual money for an episode of "Punk'd" and for his appearances on "Any Given Sunday" and "Necessary Roughness."

And get this ... T.O. scored $10 grand for promoting Yahoo Fantasy Football and $20 grand for promoting a Super Bowl party.

So why is T.O. trying to get out from under paying his baby mama's attorney's fees? It's because he spends like a mutha. His average monthly expenses are $82,178.30, plus $44,602 in child support.