After i pee, a teaspoon of urine still comes out of penis when i sit down or walk. if i drink a lot of water or caffeine, it happens more. ?

Urinary incontinence: Prevalence of urinary dribbling after urinating increase with age. Divided in stress, urge, and overflow incontinence. Overflow very common, which is the constant dribbling of urine usually associated with urinating frequently in small amounts. Many causes for above problems. Common one is overactive bladder and prostatic problems. See your primary care for further assessment.