A person (party A) who puts another person's (party B) penis into party A's mouth.
Note that party B may not always be a willing participant in the beef blowing from party A. This is known as a "descrete beef blow."
If there is a specified verbal or expressley written contract between party A (the beef blower) and party B (the beef blowee) then the beef blow shall be considered consentual and therefore be a standard beef blow.
I hooked up with Kate last night, she's a total beef blower.