Frig is a somewhat vulgar term for sexual intercourse, synonymous with other cruder words like fuck, screw, or bang. These words all share the same colloquial meaning and can be used interchangeably, though some may have different connotations or levels of explicitness. Other synonyms for frig include shag, bonk, hump, and copulate, all conveying a similar sense of physical intimacy. These words may be more or less appropriate depending on the context and the audience, and it is important to use language mindfully and respectfully. While slang terms for sex may be common in casual conversation or entertainment, they should be avoided in professional or formal settings.