Food, meal (negative). Also referred to as жрачка. Used casually to refer to groceries, a meal, or catering, often implying large quantities or basic quality or to dismiss low-quality or unappealing food (надо купить какой-нибудь жратвы — “we need to buy some grub”).
Сегодня на улице холодный порывистый ветер. Как не хочется вылезать в магазин за жратвой!..
Today a cold gusty wind is blowing outside. I so don’t want to go out to buy food!..
(Ерофеев Виктор Владимирович, Русская Красавица, 1990)

