all tweet no meat

adj. Describes a person on twitter who is often insincere, often either by outright lying to or misleading other people on twitter...
They can do especially this by expressing more bravado via tweet than they actually have.

{Analysis of Word}
It stems from the phrase "all talk no walk", except that meat refers largely to something of substance in general, as well as, (more specifically) the dick...
Funnily enough, because "A man's substance is largely his dick" (NA), a greater solidity of meaning is given to this double-entendre, (meat).