To wank under extreme horror or terror, usually under extreme, life or death circumstances as a last attempt at pleasure. Characterized by furious masturbation accompanied by screams and shouts.
Captain Bob: "Attention passengers, fasten all safety belts-we are heading for a crash landing."
Terrified passenger: "Time for a terror wank..." *Fap fap fap*
When you haven't fapped for more than a week and finally nut shouting: 'allahu akbar' as you cum
I haven't fapped for 2 weeks and just had a terrorism wank, yeah my jizz can take down buildings