flustered

Short definition from Wiktionary

Adjective

1. 1
   Confused, befuddled, in a state of panic by having become overwrought with confusion.
2. 2
   Emotionally overwhelmed or visibly embarrassed, especially in a sexual or romantic context.
3. 3
   Emotionally overwhelmed or visibly embarrassed, especially in a sexual or romantic context: Turned on, horny.

Verb

1. 1
   simple past and past participle of fluster