Definition: In the world of slang and profanity, '3644.10 (4 BUTYLPHENYL) 10H PHENOXAZINE; 713761 15 0' is a euphemism for a very dangerous substance known as 'Bulldozer'. The term comes from the fact that it's extremely potent, much stronger than even legal medicine like aspirin. This drug can cause severe side effects if not used responsibly; it can lead to organ damage and death within hours of use.
For an edgy example sentence: "Bulldozer? I see '3644.10 (4 BUTYLPHENYL) 10H PHENOXAZINE; 713761 15 0' in the streets, I'm thinking it's not just a drug but a weapon too."