"warning warning" is a correct and usable phrase in written English.
It is typically used to alert readers of something potentially dangerous or hazardous. For example, "Warning warning! Dangerous objects ahead!".
So I followed him outside to witness the opening of the can, which is done inside a plastic bag (again: warning, warning, warning).
But so far we are forced to make the following warning: WARNING: So far do not know, if the high dose vitamin D treatment with 12500 IE is possible in pregnancy.
We automatically go into defense mode: "warning, warning, salesman, salesman!" The opposite scenario would be when you talk slowly to someone who speaks fast.
Your own heart attack warning warning system--You're going to have a heart attack--in two weeks.
Warning! Warning! 50th anniversary 'Lost in Space' Blu-ray and book approaching!
South Korea wants to allow verbal warnings, warning shots and finally shots to kill.
For example, national guidelines in Spain would have prescribed that Wilson incrementally pursue verbal warnings, warning shots, and shots at nonvital parts of the body before resorting to deadly force.
Military flight manuals contain three types of warnings; WARNING, CAUTION and NOTE messages convey personal injury or loss of life hazards, material damage hazards and essential information respectively.
The reason for this is in the warnings (warning no.2).
Such services would include close approach warnings, warnings of potential radio frequency interference, and other offerings designed to help make operators aware of possible threats to the safe operation of their spacecraft and measures they can take to lessen these threats.
