1. to pour out and spread, as a fluid.
2. to spread or scatter widely or thinly; disseminate.
3. to spread.
–adjective
4. characterized by great length or discursiveness in speech or writing; wordy.
5. widely spread or scattered; dispersed.
http://dictionary.reference.com/browse/diffuse
She watched in horror as the perfume that she bought in Paris diffused all over her nice rug from Turkey.