Annoy a fellow motorist, perhaps

• Shoulder-tap a dancer
• Interrupt a conver­sation
• Interrupt, as a news broadcast
• Act rudely on the dance floor
• Tap on the shoulder, maybe
• Act rudely at the checkout counter
• Words after "May I"
• Interrupt with a shoulder tap

Wiktionary Word definitions in Wiktionary
n. (context biochemistry English) A waxy polymer of hydroxy acids that is the main constituent of plant cuticle

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Cutin \Cu"tin\ (k[=u]"t[i^]n), n. [L. cutis skin, outside.] (Plant Physiol.) A waxy substance containing fatty acids, soaps, and resinous material which, combined with cellulose, forms a substance nearly impervious to water and constituting the cuticle ...