Hitchhiker/ˈhɪtʃər/ Definition 1 of 3Pro Tip 1/3Informal Context Hitchhiking is informal and not recommended in all places due to safety concerns. While hitchhiking can be adventurous, it's not safe everywhere. Pro Tip 2/3Body Language Thumb up is a common gesture by hitchhikers to signal they need a ride. Standing by the roadside, the hitchhiker raised his thumb to passing cars. Pro Tip 3/3Cultural Variation Hitchhiking customs and its acceptance vary widely across different cultures. In some countries, you'll see a hitchhiker in nearly every town.